40643590 has 16 divisors (see below), whose sum is σ = 78786288. Its totient is φ = 15006816.

The previous prime is 40643569. The next prime is 40643597. The reversal of 40643590 is 9534604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40643597) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 156192 + ... + 156451.

It is an arithmetic number, because the mean of its divisors is an integer number (4924143).

Almost surely, 2^40643590 is an apocalyptic number.

40643590 is a deficient number, since it is larger than the sum of its proper divisors (38142698).

40643590 is a wasteful number, since it uses less digits than its factorization.

40643590 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 312663.

The product of its (nonzero) digits is 12960, while the sum is 31.

The square root of 40643590 is about 6375.2325447783. The cubic root of 40643590 is about 343.8196447318.

The spelling of 40643590 in words is "forty million, six hundred forty-three thousand, five hundred ninety".