40640244 has 24 divisors (see below), whose sum is σ = 95184768. Its totient is φ = 13495680.

The previous prime is 40640239. The next prime is 40640311. The reversal of 40640244 is 44204604.

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, 2997 + ... + 9500.

It is an arithmetic number, because the mean of its divisors is an integer number (3966032).

Almost surely, 2^40640244 is an apocalyptic number.

It is an amenable number.

40640244 is an abundant number, since it is smaller than the sum of its proper divisors (54544524).

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

40640244 is a wasteful number, since it uses less digits than its factorization.

40640244 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12775 (or 12773 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 24.

The square root of 40640244 is about 6374.9701175770. The cubic root of 40640244 is about 343.8102094424.

Adding to 40640244 its reverse (44204604), we get a palindrome (84844848).

The spelling of 40640244 in words is "forty million, six hundred forty thousand, two hundred forty-four".