138694499 has 2 divisors, whose sum is σ = 138694500. Its totient is φ = 138694498.

The previous prime is 138694477. The next prime is 138694519. The reversal of 138694499 is 994496831.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 138694499 - 2²⁴ = 121917283 is a prime.

It is a super-2 number, since 2×138694499² = 38472328105722002, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 138694499.

It is not a weakly prime, because it can be changed into another prime (138694099) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69347249 + 69347250.

It is an arithmetic number, because the mean of its divisors is an integer number (69347250).

Almost surely, 2^138694499 is an apocalyptic number.

138694499 is a deficient number, since it is larger than the sum of its proper divisors (1).

138694499 is an equidigital number, since it uses as much as digits as its factorization.

138694499 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1679616, while the sum is 53.

The square root of 138694499 is about 11776.8628675042. The cubic root of 138694499 is about 517.6303656875.

The spelling of 138694499 in words is "one hundred thirty-eight million, six hundred ninety-four thousand, four hundred ninety-nine".