43839090621 has 40 divisors (see below), whose sum is σ = 69123486080. Its totient is φ = 27612047232.

The previous prime is 43839090613. The next prime is 43839090641. The reversal of 43839090621 is 12609093834.

It is a happy number.

It is not a de Polignac number, because 43839090621 - 2³ = 43839090613 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43839090641) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 526005 + ... + 603621.

It is an arithmetic number, because the mean of its divisors is an integer number (1728087152).

Almost surely, 2^43839090621 is an apocalyptic number.

It is an amenable number.

43839090621 is a deficient number, since it is larger than the sum of its proper divisors (25284395459).

43839090621 is a wasteful number, since it uses less digits than its factorization.

43839090621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78015 (or 78006 counting only the distinct ones).

The product of its (nonzero) digits is 279936, while the sum is 45.

The spelling of 43839090621 in words is "forty-three billion, eight hundred thirty-nine million, ninety thousand, six hundred twenty-one".