39997907 has 8 divisors (see below), whose sum is σ = 42164160. Its totient is φ = 37837800.

The previous prime is 39997871. The next prime is 39997927. The reversal of 39997907 is 70979993.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 39997907 - 2¹⁸ = 39735763 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (39997927) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18968 + ... + 20970.

It is an arithmetic number, because the mean of its divisors is an integer number (5270520).

Almost surely, 2^39997907 is an apocalyptic number.

39997907 is a deficient number, since it is larger than the sum of its proper divisors (2166253).

39997907 is a wasteful number, since it uses less digits than its factorization.

39997907 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3073.

The product of its (nonzero) digits is 964467, while the sum is 53.

The square root of 39997907 is about 6324.3898519936. The cubic root of 39997907 is about 341.9892242652.

It can be divided in two parts, 39997 and 907, that added together give a palindrome (40904).

The spelling of 39997907 in words is "thirty-nine million, nine hundred ninety-seven thousand, nine hundred seven".