39640900 has 36 divisors (see below), whose sum is σ = 92640772. Its totient is φ = 14636160.

The previous prime is 39640879. The next prime is 39640901. The reversal of 39640900 is 904693.

It can be written as a sum of positive squares in 6 ways, for example, as 12787776 + 26853124 = 3576^2 + 5182^2 .

It is not an unprimeable number, because it can be changed into a prime (39640901) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13947 + ... + 16546.

Almost surely, 2^39640900 is an apocalyptic number.

It is an amenable number.

39640900 is an abundant number, since it is smaller than the sum of its proper divisors (52999872).

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

39640900 is a wasteful number, since it uses less digits than its factorization.

39640900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30520 (or 30513 counting only the distinct ones).

The product of its (nonzero) digits is 5832, while the sum is 31.

The square root of 39640900 is about 6296.1019686787. The cubic root of 39640900 is about 340.9686907784.

The spelling of 39640900 in words is "thirty-nine million, six hundred forty thousand, nine hundred".