40643820 has 72 divisors (see below), whose sum is σ = 140902944. Its totient is φ = 9289728.

The previous prime is 40643809. The next prime is 40643839. The reversal of 40643820 is 2834604.

40643820 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 23 ways as a sum of consecutive naturals, for example, 14869 + ... + 17388.

Almost surely, 2^40643820 is an apocalyptic number.

It is an amenable number.

40643820 is an abundant number, since it is smaller than the sum of its proper divisors (100259124).

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

40643820 is a wasteful number, since it uses less digits than its factorization.

40643820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32279 (or 32274 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 27.

The square root of 40643820 is about 6375.2505833104. The cubic root of 40643820 is about 343.8202932832.

The spelling of 40643820 in words is "forty million, six hundred forty-three thousand, eight hundred twenty".