39913905 has 16 divisors (see below), whose sum is σ = 63978624. Its totient is φ = 21248640.

The previous prime is 39913903. The next prime is 39913921. The reversal of 39913905 is 50931993.

It is not a de Polignac number, because 39913905 - 2¹ = 39913903 is a prime.

It is not an unprimeable number, because it can be changed into a prime (39913903) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7357 + ... + 11573.

It is an arithmetic number, because the mean of its divisors is an integer number (3998664).

Almost surely, 2^39913905 is an apocalyptic number.

It is an amenable number.

39913905 is a deficient number, since it is larger than the sum of its proper divisors (24064719).

39913905 is a wasteful number, since it uses less digits than its factorization.

39913905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4856.

The product of its (nonzero) digits is 32805, while the sum is 39.

The square root of 39913905 is about 6317.7452465259. The cubic root of 39913905 is about 341.7496457852.

The spelling of 39913905 in words is "thirty-nine million, nine hundred thirteen thousand, nine hundred five".