43980813 has 24 divisors (see below), whose sum is σ = 66242176. Its totient is φ = 29160000.

The previous prime is 43980809. The next prime is 43980829. The reversal of 43980813 is 31808934.

It is not a de Polignac number, because 43980813 - 2² = 43980809 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 (43980883) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 58188 + ... + 58938.

Almost surely, 2^43980813 is an apocalyptic number.

It is an amenable number.

43980813 is a deficient number, since it is larger than the sum of its proper divisors (22261363).

43980813 is an equidigital number, since it uses as much as digits as its factorization.

43980813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1007 (or 995 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

The square root of 43980813 is about 6631.8031484657. The cubic root of 43980813 is about 352.9835103191.

The spelling of 43980813 in words is "forty-three million, nine hundred eighty thousand, eight hundred thirteen".