39945866 has 16 divisors (see below), whose sum is σ = 64779360. Its totient is φ = 18409680.

The previous prime is 39945859. The next prime is 39945881. The reversal of 39945866 is 66854993.

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, 12800 + ... + 15611.

It is an arithmetic number, because the mean of its divisors is an integer number (4048710).

Almost surely, 2^39945866 is an apocalyptic number.

39945866 is a deficient number, since it is larger than the sum of its proper divisors (24833494).

39945866 is a wasteful number, since it uses less digits than its factorization.

39945866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28469.

The product of its digits is 1399680, while the sum is 50.

The square root of 39945866 is about 6320.2742029124. The cubic root of 39945866 is about 341.8408399550.

The spelling of 39945866 in words is "thirty-nine million, nine hundred forty-five thousand, eight hundred sixty-six".