42939187 has 2 divisors, whose sum is σ = 42939188. Its totient is φ = 42939186.

The previous prime is 42939179. The next prime is 42939199. The reversal of 42939187 is 78193924.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 42939187 - 2³ = 42939179 is a prime.

It is not a weakly prime, because it can be changed into another prime (42939287) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21469593 + 21469594.

It is an arithmetic number, because the mean of its divisors is an integer number (21469594).

Almost surely, 2^42939187 is an apocalyptic number.

42939187 is a deficient number, since it is larger than the sum of its proper divisors (1).

42939187 is an equidigital number, since it uses as much as digits as its factorization.

42939187 is an evil number, because the sum of its binary digits is even.

The product of its digits is 108864, while the sum is 43.

The square root of 42939187 is about 6552.7999359053. The cubic root of 42939187 is about 350.1745714170.

The spelling of 42939187 in words is "forty-two million, nine hundred thirty-nine thousand, one hundred eighty-seven".