43640812 has 12 divisors (see below), whose sum is σ = 76878256. Its totient is φ = 21675600.

The previous prime is 43640801. The next prime is 43640813. The reversal of 43640812 is 21804634.

It is a hoax number, since the sum of its digits (28) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (43640813) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35523 + ... + 36730.

Almost surely, 2^43640812 is an apocalyptic number.

It is an amenable number.

43640812 is a deficient number, since it is larger than the sum of its proper divisors (33237444).

43640812 is a wasteful number, since it uses less digits than its factorization.

43640812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72408 (or 72406 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 28.

The square root of 43640812 is about 6606.1192844211. The cubic root of 43640812 is about 352.0715569917.

The spelling of 43640812 in words is "forty-three million, six hundred forty thousand, eight hundred twelve".