1620432 has 120 divisors (see below), whose sum is σ = 5277440. Its totient is φ = 475200.

The previous prime is 1620431. The next prime is 1620439. The reversal of 1620432 is 2340261.

It is a happy number.

1620432 is a `hidden beast` number, since 1 + 620 + 43 + 2 = 666.

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

It is a nialpdrome in base 6.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1620431) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 52257 + ... + 52287.

2^1620432 is an apocalyptic number.

1620432 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 1620432, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2638720).

1620432 is an abundant number, since it is smaller than the sum of its proper divisors (3657008).

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

1620432 is a wasteful number, since it uses less digits than its factorization.

1620432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70 (or 47 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 1620432 is about 1272.9619004511. The cubic root of 1620432 is about 117.4564679543.

Adding to 1620432 its reverse (2340261), we get a palindrome (3960693).

The spelling of 1620432 in words is "one million, six hundred twenty thousand, four hundred thirty-two".