15561432 has 48 divisors (see below), whose sum is σ = 43982640. Its totient is φ = 4961088.

The previous prime is 15561431. The next prime is 15561439. The reversal of 15561432 is 23416551.

15561432 is a `hidden beast` number, since 15 + 5 + 614 + 32 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 15561396 and 15561405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15561431) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3043 + ... + 6354.

It is an arithmetic number, because the mean of its divisors is an integer number (916305).

Almost surely, 2^15561432 is an apocalyptic number.

15561432 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

15561432 is an abundant number, since it is smaller than the sum of its proper divisors (28421208).

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

15561432 is a wasteful number, since it uses less digits than its factorization.

15561432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9432 (or 9425 counting only the distinct ones).

The product of its digits is 3600, while the sum is 27.

The square root of 15561432 is about 3944.7980936925. The cubic root of 15561432 is about 249.6605098611.

Adding to 15561432 its reverse (23416551), we get a palindrome (38977983).

The spelling of 15561432 in words is "fifteen million, five hundred sixty-one thousand, four hundred thirty-two".