39649906 has 4 divisors (see below), whose sum is σ = 59474862. Its totient is φ = 19824952.

The previous prime is 39649871. The next prime is 39649919. The reversal of 39649906 is 60994693.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 23609881 + 16040025 = 4859^2 + 4005^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9912475 + ... + 9912478.

Almost surely, 2^39649906 is an apocalyptic number.

39649906 is a deficient number, since it is larger than the sum of its proper divisors (19824956).

39649906 is a wasteful number, since it uses less digits than its factorization.

39649906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19824955.

The product of its (nonzero) digits is 314928, while the sum is 46.

The square root of 39649906 is about 6296.8171324884. The cubic root of 39649906 is about 340.9945103361.

The spelling of 39649906 in words is "thirty-nine million, six hundred forty-nine thousand, nine hundred six".