39899709 has 20 divisors (see below), whose sum is σ = 59938560. Its totient is φ = 26450280.

The previous prime is 39899707. The next prime is 39899711. The reversal of 39899709 is 90799893.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (39899707) and next prime (39899711).

It is not a de Polignac number, because 39899709 - 2¹ = 39899707 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39899701) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 14182 + ... + 16760.

It is an arithmetic number, because the mean of its divisors is an integer number (2996928).

Almost surely, 2^39899709 is an apocalyptic number.

It is an amenable number.

39899709 is a deficient number, since it is larger than the sum of its proper divisors (20038851).

39899709 is a wasteful number, since it uses less digits than its factorization.

39899709 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2782 (or 2773 counting only the distinct ones).

The product of its (nonzero) digits is 1102248, while the sum is 54.

The square root of 39899709 is about 6316.6216445185. The cubic root of 39899709 is about 341.7091247917.

The spelling of 39899709 in words is "thirty-nine million, eight hundred ninety-nine thousand, seven hundred nine".