40039640 has 32 divisors (see below), whose sum is σ = 90342000. Its totient is φ = 15970944.

The previous prime is 40039627. The next prime is 40039651. The reversal of 40039640 is 4693004.

40039640 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 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, 15566 + ... + 17954.

Almost surely, 2^40039640 is an apocalyptic number.

40039640 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

40039640 is an abundant number, since it is smaller than the sum of its proper divisors (50302360).

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

40039640 is a wasteful number, since it uses less digits than its factorization.

40039640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2819 (or 2815 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 26.

The square root of 40039640 is about 6327.6883614793. The cubic root of 40039640 is about 342.1081244482.

The spelling of 40039640 in words is "forty million, thirty-nine thousand, six hundred forty".