138275507 has 2 divisors, whose sum is σ = 138275508. Its totient is φ = 138275506.

The previous prime is 138275479. The next prime is 138275539. The reversal of 138275507 is 705572831.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (705572831) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 138275507 - 2²⁴ = 121498291 is a prime.

It is a super-2 number, since 2×138275507² = 38240231672214098, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (138272507) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69137753 + 69137754.

It is an arithmetic number, because the mean of its divisors is an integer number (69137754).

Almost surely, 2^138275507 is an apocalyptic number.

138275507 is a deficient number, since it is larger than the sum of its proper divisors (1).

138275507 is an equidigital number, since it uses as much as digits as its factorization.

138275507 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 58800, while the sum is 38.

The square root of 138275507 is about 11759.0606342514. The cubic root of 138275507 is about 517.1085912118.

The spelling of 138275507 in words is "one hundred thirty-eight million, two hundred seventy-five thousand, five hundred seven".