39873139 has 2 divisors, whose sum is σ = 39873140. Its totient is φ = 39873138.

The previous prime is 39873131. The next prime is 39873151. The reversal of 39873139 is 93137893.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 39873139 - 2³ = 39873131 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 39873095 and 39873104.

It is not a weakly prime, because it can be changed into another prime (39873131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19936569 + 19936570.

It is an arithmetic number, because the mean of its divisors is an integer number (19936570).

Almost surely, 2^39873139 is an apocalyptic number.

39873139 is a deficient number, since it is larger than the sum of its proper divisors (1).

39873139 is an equidigital number, since it uses as much as digits as its factorization.

39873139 is an evil number, because the sum of its binary digits is even.

The product of its digits is 122472, while the sum is 43.

The square root of 39873139 is about 6314.5181130471. The cubic root of 39873139 is about 341.6332576759.

It can be divided in two parts, 398 and 73139, that added together give a palindrome (73537).

The spelling of 39873139 in words is "thirty-nine million, eight hundred seventy-three thousand, one hundred thirty-nine".