138794507 has 2 divisors, whose sum is σ = 138794508. Its totient is φ = 138794506.

The previous prime is 138794473. The next prime is 138794567. The reversal of 138794507 is 705497831.

It is a weak prime.

It is an emirp because it is prime and its reverse (705497831) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 138794507 - 2¹⁶ = 138728971 is a prime.

It is not a weakly prime, because it can be changed into another prime (138794567) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69397253 + 69397254.

It is an arithmetic number, because the mean of its divisors is an integer number (69397254).

Almost surely, 2^138794507 is an apocalyptic number.

138794507 is a deficient number, since it is larger than the sum of its proper divisors (1).

138794507 is an equidigital number, since it uses as much as digits as its factorization.

138794507 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 211680, while the sum is 44.

The square root of 138794507 is about 11781.1080548478. The cubic root of 138794507 is about 517.7547511545.

The spelling of 138794507 in words is "one hundred thirty-eight million, seven hundred ninety-four thousand, five hundred seven".