40639444 has 24 divisors (see below), whose sum is σ = 72122400. Its totient is φ = 20035680.

The previous prime is 40639441. The next prime is 40639463. The reversal of 40639444 is 44493604.

It is a happy number.

40639444 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40639441) by changing a digit.

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, 150942 + ... + 151210.

It is an arithmetic number, because the mean of its divisors is an integer number (3005100).

Almost surely, 2^40639444 is an apocalyptic number.

It is an amenable number.

40639444 is a deficient number, since it is larger than the sum of its proper divisors (31482956).

40639444 is a wasteful number, since it uses less digits than its factorization.

40639444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 663 (or 661 counting only the distinct ones).

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

The square root of 40639444 is about 6374.9073718761. The cubic root of 40639444 is about 343.8079534686.

The spelling of 40639444 in words is "forty million, six hundred thirty-nine thousand, four hundred forty-four".