43431990 has 32 divisors (see below), whose sum is σ = 119128320. Its totient is φ = 9927264.

The previous prime is 43431989. The next prime is 43432001. The reversal of 43431990 is 9913434.

43431990 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 103200 + ... + 103619.

It is an arithmetic number, because the mean of its divisors is an integer number (3722760).

Almost surely, 2^43431990 is an apocalyptic number.

43431990 is an abundant number, since it is smaller than the sum of its proper divisors (75696330).

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

43431990 is a wasteful number, since it uses less digits than its factorization.

43431990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 206836.

The product of its (nonzero) digits is 11664, while the sum is 33.

The square root of 43431990 is about 6590.2951375488. The cubic root of 43431990 is about 351.5091028630.

The spelling of 43431990 in words is "forty-three million, four hundred thirty-one thousand, nine hundred ninety".