139077839 has 2 divisors, whose sum is σ = 139077840. Its totient is φ = 139077838.

The previous prime is 139077821. The next prime is 139077847. The reversal of 139077839 is 938770931.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 139077839 - 2¹² = 139073743 is a prime.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 139077793 and 139077802.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (139077889) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69538919 + 69538920.

It is an arithmetic number, because the mean of its divisors is an integer number (69538920).

Almost surely, 2^139077839 is an apocalyptic number.

139077839 is a deficient number, since it is larger than the sum of its proper divisors (1).

139077839 is an equidigital number, since it uses as much as digits as its factorization.

139077839 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 285768, while the sum is 47.

The square root of 139077839 is about 11793.1267694365. The cubic root of 139077839 is about 518.1068226795.

The spelling of 139077839 in words is "one hundred thirty-nine million, seventy-seven thousand, eight hundred thirty-nine".