39910639 has 4 divisors (see below), whose sum is σ = 40225024. Its totient is φ = 39596256.

The previous prime is 39910613. The next prime is 39910649. The reversal of 39910639 is 93601993.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 93601993 = 97 ⋅964969.

It is a cyclic number.

It is not a de Polignac number, because 39910639 - 2⁷ = 39910511 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 (39910649) 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, 157002 + ... + 157255.

It is an arithmetic number, because the mean of its divisors is an integer number (10056256).

Almost surely, 2^39910639 is an apocalyptic number.

39910639 is a deficient number, since it is larger than the sum of its proper divisors (314385).

39910639 is a wasteful number, since it uses less digits than its factorization.

39910639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 314384.

The product of its (nonzero) digits is 39366, while the sum is 40.

The square root of 39910639 is about 6317.4867629462. The cubic root of 39910639 is about 341.7403241817.

The spelling of 39910639 in words is "thirty-nine million, nine hundred ten thousand, six hundred thirty-nine".