39645444 has 24 divisors (see below), whose sum is σ = 92782368. Its totient is φ = 13175680.

The previous prime is 39645433. The next prime is 39645461. The reversal of 39645444 is 44454693.

It is a super-2 number, since 2×39645444² = 3143522459914272, which contains 22 as substring.

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 7 ways as a sum of consecutive naturals, for example, 597 + ... + 8924.

It is an arithmetic number, because the mean of its divisors is an integer number (3865932).

Almost surely, 2^39645444 is an apocalyptic number.

It is an amenable number.

39645444 is an abundant number, since it is smaller than the sum of its proper divisors (53136924).

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

39645444 is a wasteful number, since it uses less digits than its factorization.

39645444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9875 (or 9873 counting only the distinct ones).

The product of its digits is 207360, while the sum is 39.

The square root of 39645444 is about 6296.4628165344. The cubic root of 39645444 is about 340.9817185901.

Subtracting 39645444 from its reverse (44454693), we obtain a square (4809249 = 2193²).

The spelling of 39645444 in words is "thirty-nine million, six hundred forty-five thousand, four hundred forty-four".