15557042 has 6 divisors (see below), whose sum is σ = 23343933. Its totient is φ = 7775732.

The previous prime is 15557041. The next prime is 15557053. The reversal of 15557042 is 24075551.

It can be written as a sum of positive squares in 2 ways, for example, as 15295921 + 261121 = 3911^2 + 511^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=2789.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 15556996 and 15557014.

It is not an unprimeable number, because it can be changed into a prime (15557041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 4184 + ... + 6972.

Almost surely, 2^15557042 is an apocalyptic number.

15557042 is a deficient number, since it is larger than the sum of its proper divisors (7786891).

15557042 is an frugal number, since it uses more digits than its factorization.

15557042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5580 (or 2791 counting only the distinct ones).

The product of its (nonzero) digits is 7000, while the sum is 29.

The square root of 15557042 is about 3944.2416254586. The cubic root of 15557042 is about 249.6370306012.

The spelling of 15557042 in words is "fifteen million, five hundred fifty-seven thousand, forty-two".