39920137 has 4 divisors (see below), whose sum is σ = 39946500. Its totient is φ = 39893776.

The previous prime is 39920119. The next prime is 39920143. The reversal of 39920137 is 73102993.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 34058896 + 5861241 = 5836^2 + 2421^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-39920137 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (39920107) 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, 10762 + ... + 13987.

It is an arithmetic number, because the mean of its divisors is an integer number (9986625).

Almost surely, 2^39920137 is an apocalyptic number.

It is an amenable number.

39920137 is a deficient number, since it is larger than the sum of its proper divisors (26363).

39920137 is a wasteful number, since it uses less digits than its factorization.

39920137 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26362.

The product of its (nonzero) digits is 10206, while the sum is 34.

The square root of 39920137 is about 6318.2384412113. The cubic root of 39920137 is about 341.7674313410.

The spelling of 39920137 in words is "thirty-nine million, nine hundred twenty thousand, one hundred thirty-seven".