40640402 has 16 divisors (see below), whose sum is σ = 69394752. Its totient is φ = 17669520.

The previous prime is 40640399. The next prime is 40640417. The reversal of 40640402 is 20404604.

40640402 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 7 ways as a sum of consecutive naturals, for example, 39653 + ... + 40664.

It is an arithmetic number, because the mean of its divisors is an integer number (4337172).

Almost surely, 2^40640402 is an apocalyptic number.

40640402 is a deficient number, since it is larger than the sum of its proper divisors (28754350).

40640402 is a wasteful number, since it uses less digits than its factorization.

40640402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80353.

The product of its (nonzero) digits is 768, while the sum is 20.

The square root of 40640402 is about 6374.9825097799. The cubic root of 40640402 is about 343.8106549937.

The spelling of 40640402 in words is "forty million, six hundred forty thousand, four hundred two".