42915639 has 12 divisors (see below), whose sum is σ = 61681256. Its totient is φ = 26384448.

The previous prime is 42915629. The next prime is 42915683. The reversal of 42915639 is 93651924.

It is not a de Polignac number, because 42915639 - 2¹⁵ = 42882871 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a junction number, because it is equal to n+sod(n) for n = 42915597 and 42915606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42915619) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 40387 + ... + 41435.

Almost surely, 2^42915639 is an apocalyptic number.

42915639 is a deficient number, since it is larger than the sum of its proper divisors (18765617).

42915639 is an equidigital number, since it uses as much as digits as its factorization.

42915639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2114 (or 1065 counting only the distinct ones).

The product of its digits is 58320, while the sum is 39.

The square root of 42915639 is about 6551.0029003199. The cubic root of 42915639 is about 350.1105473929.

Multiplying 42915639 by its sum of digits (39), we get a square (1673709921 = 40911²).

42915639 divided by its sum of digits (39) gives a square (1100401 = 1049²).

The spelling of 42915639 in words is "forty-two million, nine hundred fifteen thousand, six hundred thirty-nine".