138459877 has 2 divisors, whose sum is σ = 138459878. Its totient is φ = 138459876.

The previous prime is 138459863. The next prime is 138459907. The reversal of 138459877 is 778954831.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 128731716 + 9728161 = 11346^2 + 3119^2 .

It is a cyclic number.

It is not a de Polignac number, because 138459877 - 2⁷ = 138459749 is a prime.

It is a super-2 number, since 2×138459877² = 38342275077710258, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138459077) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69229938 + 69229939.

It is an arithmetic number, because the mean of its divisors is an integer number (69229939).

Almost surely, 2^138459877 is an apocalyptic number.

It is an amenable number.

138459877 is a deficient number, since it is larger than the sum of its proper divisors (1).

138459877 is an equidigital number, since it uses as much as digits as its factorization.

138459877 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1693440, while the sum is 52.

The square root of 138459877 is about 11766.8975095392. The cubic root of 138459877 is about 517.3383184926.

The spelling of 138459877 in words is "one hundred thirty-eight million, four hundred fifty-nine thousand, eight hundred seventy-seven".