139331839 has 2 divisors, whose sum is σ = 139331840. Its totient is φ = 139331838.

The previous prime is 139331833. The next prime is 139331897. The reversal of 139331839 is 938133931.

139331839 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 139331839 - 2¹⁹ = 138807551 is a prime.

It is a super-2 number, since 2×139331839² = 38826722718243842, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (139331833) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69665919 + 69665920.

It is an arithmetic number, because the mean of its divisors is an integer number (69665920).

Almost surely, 2^139331839 is an apocalyptic number.

139331839 is a deficient number, since it is larger than the sum of its proper divisors (1).

139331839 is an equidigital number, since it uses as much as digits as its factorization.

139331839 is an evil number, because the sum of its binary digits is even.

The product of its digits is 52488, while the sum is 40.

The square root of 139331839 is about 11803.8908415827. The cubic root of 139331839 is about 518.4220396861.

The spelling of 139331839 in words is "one hundred thirty-nine million, three hundred thirty-one thousand, eight hundred thirty-nine".