138249707 has 2 divisors, whose sum is σ = 138249708. Its totient is φ = 138249706.

The previous prime is 138249703. The next prime is 138249731. The reversal of 138249707 is 707942831.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 138249707 - 2² = 138249703 is a prime.

It is a super-2 number, since 2×138249707² = 38225962971171698, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (138249703) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69124853 + 69124854.

It is an arithmetic number, because the mean of its divisors is an integer number (69124854).

Almost surely, 2^138249707 is an apocalyptic number.

138249707 is a deficient number, since it is larger than the sum of its proper divisors (1).

138249707 is an equidigital number, since it uses as much as digits as its factorization.

138249707 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 84672, while the sum is 41.

The square root of 138249707 is about 11757.9635566709. The cubic root of 138249707 is about 517.0764278114.

The spelling of 138249707 in words is "one hundred thirty-eight million, two hundred forty-nine thousand, seven hundred seven".