1621632 has 64 divisors (see below), whose sum is σ = 4455360. Its totient is φ = 522240.

The previous prime is 1621621. The next prime is 1621637. The reversal of 1621632 is 2361261.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (64).

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

It is a junction number, because it is equal to n+sod(n) for n = 1621599 and 1621608.

It is not an unprimeable number, because it can be changed into a prime (1621637) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15693 + ... + 15795.

It is an arithmetic number, because the mean of its divisors is an integer number (69615).

2^1621632 is an apocalyptic number.

1621632 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 1621632, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2227680).

1621632 is an abundant number, since it is smaller than the sum of its proper divisors (2833728).

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

1621632 is a wasteful number, since it uses less digits than its factorization.

1621632 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161 (or 149 counting only the distinct ones).

The product of its digits is 432, while the sum is 21.

The square root of 1621632 is about 1273.4331549006. The cubic root of 1621632 is about 117.4854546655.

Adding to 1621632 its reverse (2361261), we get a palindrome (3982893).

It can be divided in two parts, 162163 and 2, that added together give a triangular number (162165 = T₅₆₉).

The spelling of 1621632 in words is "one million, six hundred twenty-one thousand, six hundred thirty-two".