139837639 has 2 divisors, whose sum is σ = 139837640. Its totient is φ = 139837638.

The previous prime is 139837637. The next prime is 139837651. The reversal of 139837639 is 936738931.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 139837639 - 2¹ = 139837637 is a prime.

Together with 139837637, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 139837592 and 139837601.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (139837637) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69918819 + 69918820.

It is an arithmetic number, because the mean of its divisors is an integer number (69918820).

Almost surely, 2^139837639 is an apocalyptic number.

139837639 is a deficient number, since it is larger than the sum of its proper divisors (1).

139837639 is an equidigital number, since it uses as much as digits as its factorization.

139837639 is an evil number, because the sum of its binary digits is even.

The product of its digits is 734832, while the sum is 49.

The square root of 139837639 is about 11825.2965713338. The cubic root of 139837639 is about 519.0486043162.

The spelling of 139837639 in words is "one hundred thirty-nine million, eight hundred thirty-seven thousand, six hundred thirty-nine".