40639344 has 80 divisors (see below), whose sum is σ = 110778624. Its totient is φ = 12812800.

The previous prime is 40639307. The next prime is 40639351. The reversal of 40639344 is 44393604.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 144484 + ... + 144764.

Almost surely, 2^40639344 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 40639344, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (55389312).

40639344 is an abundant number, since it is smaller than the sum of its proper divisors (70139280).

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

40639344 is a wasteful number, since it uses less digits than its factorization.

40639344 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 446 (or 440 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 33.

The square root of 40639344 is about 6374.8995286200. The cubic root of 40639344 is about 343.8076714698.

The spelling of 40639344 in words is "forty million, six hundred thirty-nine thousand, three hundred forty-four".