43920639 has 48 divisors (see below), whose sum is σ = 80151552. Its totient is φ = 22581504.

The previous prime is 43920637. The next prime is 43920649. The reversal of 43920639 is 93602934.

It is a happy number.

It is not a de Polignac number, because 43920639 - 2¹ = 43920637 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43920631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 23742 + ... + 25524.

It is an arithmetic number, because the mean of its divisors is an integer number (1669824).

Almost surely, 2^43920639 is an apocalyptic number.

43920639 is a deficient number, since it is larger than the sum of its proper divisors (36230913).

43920639 is a wasteful number, since it uses less digits than its factorization.

43920639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1836 (or 1833 counting only the distinct ones).

The product of its (nonzero) digits is 34992, while the sum is 36.

The square root of 43920639 is about 6627.2648204218. The cubic root of 43920639 is about 352.8224542992.

The spelling of 43920639 in words is "forty-three million, nine hundred twenty thousand, six hundred thirty-nine".