42157928 has 16 divisors (see below), whose sum is σ = 79191780. Its totient is φ = 21040128.

The previous prime is 42157891. The next prime is 42157933. The reversal of 42157928 is 82975124.

It can be written as a sum of positive squares in 2 ways, for example, as 32058244 + 10099684 = 5662^2 + 3178^2 .

It is a junction number, because it is equal to n+sod(n) for n = 42157891 and 42157900.

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 3 ways as a sum of consecutive naturals, for example, 50 + ... + 9182.

Almost surely, 2^42157928 is an apocalyptic number.

It is an amenable number.

42157928 is a deficient number, since it is larger than the sum of its proper divisors (37033852).

42157928 is a wasteful number, since it uses less digits than its factorization.

42157928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9716 (or 9712 counting only the distinct ones).

The product of its digits is 40320, while the sum is 38.

The square root of 42157928 is about 6492.9136756929. The cubic root of 42157928 is about 348.0378036177.

The spelling of 42157928 in words is "forty-two million, one hundred fifty-seven thousand, nine hundred twenty-eight".