1390238137 has 2 divisors, whose sum is σ = 1390238138. Its totient is φ = 1390238136.

The previous prime is 1390238123. The next prime is 1390238147. The reversal of 1390238137 is 7318320931.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1388233081 + 2005056 = 37259^2 + 1416^2 .

It is a cyclic number.

It is not a de Polignac number, because 1390238137 - 2⁷ = 1390238009 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1390238096 and 1390238105.

It is not a weakly prime, because it can be changed into another prime (1390238147) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 695119068 + 695119069.

It is an arithmetic number, because the mean of its divisors is an integer number (695119069).

Almost surely, 2^1390238137 is an apocalyptic number.

It is an amenable number.

1390238137 is a deficient number, since it is larger than the sum of its proper divisors (1).

1390238137 is an equidigital number, since it uses as much as digits as its factorization.

1390238137 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27216, while the sum is 37.

The square root of 1390238137 is about 37285.8972937490. The cubic root of 1390238137 is about 1116.0827589972.

The spelling of 1390238137 in words is "one billion, three hundred ninety million, two hundred thirty-eight thousand, one hundred thirty-seven".