1621332 has 36 divisors (see below), whose sum is σ = 4242420. Its totient is φ = 521472.

The previous prime is 1621309. The next prime is 1621349. The reversal of 1621332 is 2331261.

It can be written as a sum of positive squares in 2 ways, for example, as 467856 + 1153476 = 684^2 + 1074^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 268 + ... + 1820.

It is an arithmetic number, because the mean of its divisors is an integer number (117845).

2^1621332 is an apocalyptic number.

1621332 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1621332, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2121210).

1621332 is an abundant number, since it is smaller than the sum of its proper divisors (2621088).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1621332 is a wasteful number, since it uses less digits than its factorization.

1621332 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1592 (or 1587 counting only the distinct ones).

The product of its digits is 216, while the sum is 18.

The square root of 1621332 is about 1273.3153576393. The cubic root of 1621332 is about 117.4782093287.

Adding to 1621332 its reverse (2331261), we get a palindrome (3952593).

It can be divided in two parts, 1621 and 332, that added together give a triangular number (1953 = T₆₂).

The spelling of 1621332 in words is "one million, six hundred twenty-one thousand, three hundred thirty-two".