42912387 has 24 divisors (see below), whose sum is σ = 72290400. Its totient is φ = 24519600.

The previous prime is 42912383. The next prime is 42912391. The reversal of 42912387 is 78321924.

It is an interprime number because it is at equal distance from previous prime (42912383) and next prime (42912391).

It is not a de Polignac number, because 42912387 - 2² = 42912383 is a prime.

It is not an unprimeable number, because it can be changed into a prime (42912383) 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, 3864 + ... + 10037.

It is an arithmetic number, because the mean of its divisors is an integer number (3012100).

Almost surely, 2^42912387 is an apocalyptic number.

42912387 is a deficient number, since it is larger than the sum of its proper divisors (29378013).

42912387 is a wasteful number, since it uses less digits than its factorization.

42912387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13928 (or 13911 counting only the distinct ones).

The product of its digits is 24192, while the sum is 36.

The square root of 42912387 is about 6550.7546893469. The cubic root of 42912387 is about 350.1017037772.

The spelling of 42912387 in words is "forty-two million, nine hundred twelve thousand, three hundred eighty-seven".