43990436903 has 32 divisors (see below), whose sum is σ = 53688614400. Its totient is φ = 35184844800.

The previous prime is 43990436863. The next prime is 43990436957. The reversal of 43990436903 is 30963409934.

It is a happy number.

It is not a de Polignac number, because 43990436903 - 2⁶ = 43990436839 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43990439903) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8706728 + ... + 8711778.

It is an arithmetic number, because the mean of its divisors is an integer number (1677769200).

Almost surely, 2^43990436903 is an apocalyptic number.

43990436903 is a deficient number, since it is larger than the sum of its proper divisors (9698177497).

43990436903 is a wasteful number, since it uses less digits than its factorization.

43990436903 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5687.

The product of its (nonzero) digits is 1889568, while the sum is 50.

The spelling of 43990436903 in words is "forty-three billion, nine hundred ninety million, four hundred thirty-six thousand, nine hundred three".