139239937 has 2 divisors, whose sum is σ = 139239938. Its totient is φ = 139239936.

The previous prime is 139239931. The next prime is 139240001. The reversal of 139239937 is 739932931.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 138391696 + 848241 = 11764^2 + 921^2 .

It is a cyclic number.

It is not a de Polignac number, because 139239937 - 2³ = 139239929 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (139239931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69619968 + 69619969.

It is an arithmetic number, because the mean of its divisors is an integer number (69619969).

Almost surely, 2^139239937 is an apocalyptic number.

It is an amenable number.

139239937 is a deficient number, since it is larger than the sum of its proper divisors (1).

139239937 is an equidigital number, since it uses as much as digits as its factorization.

139239937 is an evil number, because the sum of its binary digits is even.

The product of its digits is 275562, while the sum is 46.

The square root of 139239937 is about 11799.9973305082. The cubic root of 139239937 is about 518.3080324794.

The spelling of 139239937 in words is "one hundred thirty-nine million, two hundred thirty-nine thousand, nine hundred thirty-seven".