42393939 has 16 divisors (see below), whose sum is σ = 64727040. Its totient is φ = 24177600.

The previous prime is 42393931. The next prime is 42393943. The reversal of 42393939 is 93939324.

It is not a de Polignac number, because 42393939 - 2³ = 42393931 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 42393939.

It is not an unprimeable number, because it can be changed into a prime (42393931) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10942 + ... + 14300.

It is an arithmetic number, because the mean of its divisors is an integer number (4045440).

Almost surely, 2^42393939 is an apocalyptic number.

42393939 is a deficient number, since it is larger than the sum of its proper divisors (22333101).

42393939 is a wasteful number, since it uses less digits than its factorization.

42393939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3970.

The product of its digits is 157464, while the sum is 42.

The square root of 42393939 is about 6511.0628164686. The cubic root of 42393939 is about 348.6860639978.

The spelling of 42393939 in words is "forty-two million, three hundred ninety-three thousand, nine hundred thirty-nine".