43985890 has 64 divisors (see below), whose sum is σ = 91155456. Its totient is φ = 15155712.

The previous prime is 43985863. The next prime is 43985891. The reversal of 43985890 is 9858934.

It is a Harshad number since it is a multiple of its sum of digits (46).

It is a self number, because there is not a number n which added to its sum of digits gives 43985890.

It is not an unprimeable number, because it can be changed into a prime (43985891) 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, 140374 + ... + 140686.

It is an arithmetic number, because the mean of its divisors is an integer number (1424304).

Almost surely, 2^43985890 is an apocalyptic number.

43985890 is an abundant number, since it is smaller than the sum of its proper divisors (47169566).

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

43985890 is a wasteful number, since it uses less digits than its factorization.

43985890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 403.

The product of its (nonzero) digits is 311040, while the sum is 46.

The square root of 43985890 is about 6632.1859141613. The cubic root of 43985890 is about 352.9970922139.

The spelling of 43985890 in words is "forty-three million, nine hundred eighty-five thousand, eight hundred ninety".