43978990 has 32 divisors (see below), whose sum is σ = 90118656. Its totient is φ = 15296160.

The previous prime is 43978943. The next prime is 43979003. The reversal of 43978990 is 9987934.

It is a super-2 number, since 2×43978990² = 3868303122840200, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6162 + ... + 11221.

It is an arithmetic number, because the mean of its divisors is an integer number (2816208).

Almost surely, 2^43978990 is an apocalyptic number.

43978990 is an abundant number, since it is smaller than the sum of its proper divisors (46139666).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

43978990 is a wasteful number, since it uses less digits than its factorization.

43978990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17424.

The product of its (nonzero) digits is 489888, while the sum is 49.

The square root of 43978990 is about 6631.6657032755. The cubic root of 43978990 is about 352.9786332088.

The spelling of 43978990 in words is "forty-three million, nine hundred seventy-eight thousand, nine hundred ninety".