39649989 has 16 divisors (see below), whose sum is σ = 55728000. Its totient is φ = 25037376.

The previous prime is 39649969. The next prime is 39650003. The reversal of 39649989 is 98994693.

It is not a de Polignac number, because 39649989 - 2⁵ = 39649957 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39649919) by changing a digit.

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 in 15 ways as a sum of consecutive naturals, for example, 312 + ... + 8910.

It is an arithmetic number, because the mean of its divisors is an integer number (3483000).

Almost surely, 2^39649989 is an apocalyptic number.

It is an amenable number.

39649989 is a deficient number, since it is larger than the sum of its proper divisors (16078011).

39649989 is a wasteful number, since it uses less digits than its factorization.

39649989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8684.

The product of its digits is 3779136, while the sum is 57.

The square root of 39649989 is about 6296.8237231163. The cubic root of 39649989 is about 340.9947482730.

The spelling of 39649989 in words is "thirty-nine million, six hundred forty-nine thousand, nine hundred eighty-nine".