15870042 has 12 divisors (see below), whose sum is σ = 34385130. Its totient is φ = 5290008.

The previous prime is 15870017. The next prime is 15870079. The reversal of 15870042 is 24007851.

It can be written as a sum of positive squares in only one way, i.e., 13682601 + 2187441 = 3699^2 + 1479^2 .

It is a junction number, because it is equal to n+sod(n) for n = 15869988 and 15870015.

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 5 ways as a sum of consecutive naturals, for example, 440817 + ... + 440852.

Almost surely, 2^15870042 is an apocalyptic number.

15870042 is an abundant number, since it is smaller than the sum of its proper divisors (18515088).

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

15870042 is a wasteful number, since it uses less digits than its factorization.

15870042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 881677 (or 881674 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 27.

The square root of 15870042 is about 3983.7221288639. The cubic root of 15870042 is about 251.3001177218.

Adding to 15870042 its reverse (24007851), we get a palindrome (39877893).

The spelling of 15870042 in words is "fifteen million, eight hundred seventy thousand, forty-two".