39640394 has 16 divisors (see below), whose sum is σ = 61248096. Its totient is φ = 19227600.

The previous prime is 39640313. The next prime is 39640409. The reversal of 39640394 is 49304693.

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, 35789 + ... + 36879.

It is an arithmetic number, because the mean of its divisors is an integer number (3828006).

Almost surely, 2^39640394 is an apocalyptic number.

39640394 is a deficient number, since it is larger than the sum of its proper divisors (21607702).

39640394 is a wasteful number, since it uses less digits than its factorization.

39640394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1621.

The product of its (nonzero) digits is 69984, while the sum is 38.

The square root of 39640394 is about 6296.0617849573. The cubic root of 39640394 is about 340.9672399966.

The spelling of 39640394 in words is "thirty-nine million, six hundred forty thousand, three hundred ninety-four".