42939864 has 48 divisors (see below), whose sum is σ = 126870120. Its totient is φ = 13011840.

The previous prime is 42939859. The next prime is 42939881. The reversal of 42939864 is 46893924.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 26317 + ... + 27900.

Almost surely, 2^42939864 is an apocalyptic number.

42939864 is a gapful number since it is divisible by the number (44) formed by its first and last digit.

It is an amenable number.

42939864 is an abundant number, since it is smaller than the sum of its proper divisors (83930256).

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

42939864 is a wasteful number, since it uses less digits than its factorization.

42939864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54240 (or 54233 counting only the distinct ones).

The product of its digits is 373248, while the sum is 45.

The square root of 42939864 is about 6552.8515930090. The cubic root of 42939864 is about 350.1764117479.

The spelling of 42939864 in words is "forty-two million, nine hundred thirty-nine thousand, eight hundred sixty-four".