42639969 has 8 divisors (see below), whose sum is σ = 56936320. Its totient is φ = 28385136.

The previous prime is 42639937. The next prime is 42639977. The reversal of 42639969 is 96993624.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 42639969 - 2⁵ = 42639937 is a prime.

It is a super-2 number, since 2×42639969² = 3636333912641922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42639979) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7897 + ... + 12150.

It is an arithmetic number, because the mean of its divisors is an integer number (7117040).

Almost surely, 2^42639969 is an apocalyptic number.

It is an amenable number.

42639969 is a deficient number, since it is larger than the sum of its proper divisors (14296351).

42639969 is a wasteful number, since it uses less digits than its factorization.

42639969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20759.

The product of its digits is 629856, while the sum is 48.

The square root of 42639969 is about 6529.9287132403. The cubic root of 42639969 is about 349.3592876875.

The spelling of 42639969 in words is "forty-two million, six hundred thirty-nine thousand, nine hundred sixty-nine".