138458417 has 2 divisors, whose sum is σ = 138458418. Its totient is φ = 138458416.

The previous prime is 138458407. The next prime is 138458447. The reversal of 138458417 is 714854831.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 107143201 + 31315216 = 10351^2 + 5596^2 .

It is a cyclic number.

It is not a de Polignac number, because 138458417 - 2⁴ = 138458401 is a prime.

It is equal to p_7829915 and since 138458417 and 7829915 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (138458407) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69229208 + 69229209.

It is an arithmetic number, because the mean of its divisors is an integer number (69229209).

Almost surely, 2^138458417 is an apocalyptic number.

It is an amenable number.

138458417 is a deficient number, since it is larger than the sum of its proper divisors (1).

138458417 is an equidigital number, since it uses as much as digits as its factorization.

138458417 is an evil number, because the sum of its binary digits is even.

The product of its digits is 107520, while the sum is 41.

The square root of 138458417 is about 11766.8354709327. The cubic root of 138458417 is about 517.3365001160.

The spelling of 138458417 in words is "one hundred thirty-eight million, four hundred fifty-eight thousand, four hundred seventeen".