39859939 has 4 divisors (see below), whose sum is σ = 45554224. Its totient is φ = 34165656.

The previous prime is 39859933. The next prime is 39859957. The reversal of 39859939 is 93995893.

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

It is not a de Polignac number, because 39859939 - 2⁵ = 39859907 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 39859939.

It is not an unprimeable number, because it can be changed into a prime (39859933) 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, 2847132 + ... + 2847145.

It is an arithmetic number, because the mean of its divisors is an integer number (11388556).

Almost surely, 2^39859939 is an apocalyptic number.

39859939 is a deficient number, since it is larger than the sum of its proper divisors (5694285).

39859939 is an equidigital number, since it uses as much as digits as its factorization.

39859939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5694284.

The product of its digits is 2361960, while the sum is 55.

The square root of 39859939 is about 6313.4728161290. The cubic root of 39859939 is about 341.5955542926.

It can be divided in two parts, 3985 and 9939, that added together give a square (13924 = 118²).

The spelling of 39859939 in words is "thirty-nine million, eight hundred fifty-nine thousand, nine hundred thirty-nine".