138432817 has 2 divisors, whose sum is σ = 138432818. Its totient is φ = 138432816.

The previous prime is 138432773. The next prime is 138432823. The reversal of 138432817 is 718234831.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 127035441 + 11397376 = 11271^2 + 3376^2 .

It is a cyclic number.

It is not a de Polignac number, because 138432817 - 2¹¹ = 138430769 is a prime.

It is not a weakly prime, because it can be changed into another prime (138436817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69216408 + 69216409.

It is an arithmetic number, because the mean of its divisors is an integer number (69216409).

Almost surely, 2^138432817 is an apocalyptic number.

It is an amenable number.

138432817 is a deficient number, since it is larger than the sum of its proper divisors (1).

138432817 is an equidigital number, since it uses as much as digits as its factorization.

138432817 is an evil number, because the sum of its binary digits is even.

The product of its digits is 32256, while the sum is 37.

The square root of 138432817 is about 11765.7476175550. The cubic root of 138432817 is about 517.3046141751.

The spelling of 138432817 in words is "one hundred thirty-eight million, four hundred thirty-two thousand, eight hundred seventeen".