39907897 has 4 divisors (see below), whose sum is σ = 40280976. Its totient is φ = 39534820.

The previous prime is 39907849. The next prime is 39907927. The reversal of 39907897 is 79870993.

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, and also an emirpimes, since its reverse is a distinct semiprime: 79870993 = 41 ⋅1948073.

It is a cyclic number.

It is not a de Polignac number, because 39907897 - 2²³ = 31519289 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (39907807) 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, 186379 + ... + 186592.

It is an arithmetic number, because the mean of its divisors is an integer number (10070244).

Almost surely, 2^39907897 is an apocalyptic number.

It is an amenable number.

39907897 is a deficient number, since it is larger than the sum of its proper divisors (373079).

39907897 is a wasteful number, since it uses less digits than its factorization.

39907897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 373078.

The product of its (nonzero) digits is 857304, while the sum is 52.

The square root of 39907897 is about 6317.2697425391. The cubic root of 39907897 is about 341.7324977520.

It can be divided in two parts, 39907 and 897, that added together give a palindrome (40804).

The spelling of 39907897 in words is "thirty-nine million, nine hundred seven thousand, eight hundred ninety-seven".