138906707 has 2 divisors, whose sum is σ = 138906708. Its totient is φ = 138906706.

The previous prime is 138906697. The next prime is 138906737. The reversal of 138906707 is 707609831.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 138906707 - 2¹² = 138902611 is a prime.

It is a Chen prime.

It is equal to p_7853828 and since 138906707 and 7853828 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (138906737) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69453353 + 69453354.

It is an arithmetic number, because the mean of its divisors is an integer number (69453354).

Almost surely, 2^138906707 is an apocalyptic number.

138906707 is a deficient number, since it is larger than the sum of its proper divisors (1).

138906707 is an equidigital number, since it uses as much as digits as its factorization.

138906707 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 63504, while the sum is 41.

The square root of 138906707 is about 11785.8689539635. The cubic root of 138906707 is about 517.8942293843.

The spelling of 138906707 in words is "one hundred thirty-eight million, nine hundred six thousand, seven hundred seven".