138417457 has 2 divisors, whose sum is σ = 138417458. Its totient is φ = 138417456.

The previous prime is 138417439. The next prime is 138417569. The reversal of 138417457 is 754714831.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 91412721 + 47004736 = 9561^2 + 6856^2 .

It is a cyclic number.

It is not a de Polignac number, because 138417457 - 2⁷ = 138417329 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (138417437) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69208728 + 69208729.

It is an arithmetic number, because the mean of its divisors is an integer number (69208729).

Almost surely, 2^138417457 is an apocalyptic number.

It is an amenable number.

138417457 is a deficient number, since it is larger than the sum of its proper divisors (1).

138417457 is an equidigital number, since it uses as much as digits as its factorization.

138417457 is an evil number, because the sum of its binary digits is even.

The product of its digits is 94080, while the sum is 40.

The square root of 138417457 is about 11765.0948572462. The cubic root of 138417457 is about 517.2854807236.

The spelling of 138417457 in words is "one hundred thirty-eight million, four hundred seventeen thousand, four hundred fifty-seven".