40399644 has 24 divisors (see below), whose sum is σ = 94687488. Its totient is φ = 13406320.

The previous prime is 40399631. The next prime is 40399663. The reversal of 40399644 is 44699304.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4692 + ... + 10139.

It is an arithmetic number, because the mean of its divisors is an integer number (3945312).

Almost surely, 2^40399644 is an apocalyptic number.

It is an amenable number.

40399644 is an abundant number, since it is smaller than the sum of its proper divisors (54287844).

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

40399644 is a wasteful number, since it uses less digits than its factorization.

40399644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15065 (or 15063 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 39.

The square root of 40399644 is about 6356.0714281701. The cubic root of 40399644 is about 343.1303864437.

The spelling of 40399644 in words is "forty million, three hundred ninety-nine thousand, six hundred forty-four".