138704407 has 2 divisors, whose sum is σ = 138704408. Its totient is φ = 138704406.

The previous prime is 138704387. The next prime is 138704429. The reversal of 138704407 is 704407831.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 138704407 - 2²³ = 130315799 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138704497) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69352203 + 69352204.

It is an arithmetic number, because the mean of its divisors is an integer number (69352204).

Almost surely, 2^138704407 is an apocalyptic number.

138704407 is a deficient number, since it is larger than the sum of its proper divisors (1).

138704407 is an equidigital number, since it uses as much as digits as its factorization.

138704407 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18816, while the sum is 34.

The square root of 138704407 is about 11777.2835153103. The cubic root of 138704407 is about 517.6426914817.

The spelling of 138704407 in words is "one hundred thirty-eight million, seven hundred four thousand, four hundred seven".