40639544 has 24 divisors (see below), whose sum is σ = 83758080. Its totient is φ = 18472080.

The previous prime is 40639531. The next prime is 40639559. The reversal of 40639544 is 44593604.

It is a Smith number, since the sum of its digits (35) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 20024 + ... + 21959.

It is an arithmetic number, because the mean of its divisors is an integer number (3489920).

Almost surely, 2^40639544 is an apocalyptic number.

40639544 is a gapful number since it is divisible by the number (44) formed by its first and last digit.

It is an amenable number.

40639544 is an abundant number, since it is smaller than the sum of its proper divisors (43118536).

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

40639544 is a wasteful number, since it uses less digits than its factorization.

40639544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42011 (or 41996 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 35.

The square root of 40639544 is about 6374.9152151225. The cubic root of 40639544 is about 343.8082354670.

The spelling of 40639544 in words is "forty million, six hundred thirty-nine thousand, five hundred forty-four".