40643836 has 12 divisors (see below), whose sum is σ = 71438920. Its totient is φ = 20232720.

The previous prime is 40643809. The next prime is 40643839. The reversal of 40643836 is 63834604.

It is a hoax number, since the sum of its digits (34) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40643839) 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, 21270 + ... + 23101.

Almost surely, 2^40643836 is an apocalyptic number.

It is an amenable number.

40643836 is a deficient number, since it is larger than the sum of its proper divisors (30795084).

40643836 is a wasteful number, since it uses less digits than its factorization.

40643836 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44604 (or 44602 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 34.

The square root of 40643836 is about 6375.2518381629. The cubic root of 40643836 is about 343.8203383997.

The spelling of 40643836 in words is "forty million, six hundred forty-three thousand, eight hundred thirty-six".