43981620 has 48 divisors (see below), whose sum is σ = 123596928. Its totient is φ = 11685760.

The previous prime is 43981607. The next prime is 43981649. The reversal of 43981620 is 2618934.

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, 17482 + ... + 19838.

It is an arithmetic number, because the mean of its divisors is an integer number (2574936).

Almost surely, 2^43981620 is an apocalyptic number.

It is an amenable number.

43981620 is an abundant number, since it is smaller than the sum of its proper divisors (79615308).

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

43981620 is a wasteful number, since it uses less digits than its factorization.

43981620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2680 (or 2678 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 33.

The square root of 43981620 is about 6631.8639913677. The cubic root of 43981620 is about 352.9856692602.

The spelling of 43981620 in words is "forty-three million, nine hundred eighty-one thousand, six hundred twenty".