39749709 has 4 divisors (see below), whose sum is σ = 52999616. Its totient is φ = 26499804.

The previous prime is 39749707. The next prime is 39749711. The reversal of 39749709 is 90794793.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (39749707) and next prime (39749711).

It is not a de Polignac number, because 39749709 - 2¹ = 39749707 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39749707) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6624949 + ... + 6624954.

It is an arithmetic number, because the mean of its divisors is an integer number (13249904).

Almost surely, 2^39749709 is an apocalyptic number.

It is an amenable number.

39749709 is a deficient number, since it is larger than the sum of its proper divisors (13249907).

39749709 is a wasteful number, since it uses less digits than its factorization.

39749709 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13249906.

The product of its (nonzero) digits is 428652, while the sum is 48.

The square root of 39749709 is about 6304.7370286159. The cubic root of 39749709 is about 341.2803770138.

The spelling of 39749709 in words is "thirty-nine million, seven hundred forty-nine thousand, seven hundred nine".