138356407 has 16 divisors (see below), whose sum is σ = 161589760. Its totient is φ = 116015328.

The previous prime is 138356381. The next prime is 138356411. The reversal of 138356407 is 704653831.

It is a cyclic number.

It is not a de Polignac number, because 138356407 - 2⁷ = 138356279 is a prime.

It is the 11763-rd Hogben number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138326407) by changing a digit.

It is a nontrivial repunit in base 11762.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 72694 + ... + 74572.

It is an arithmetic number, because the mean of its divisors is an integer number (10099360).

Almost surely, 2^138356407 is an apocalyptic number.

138356407 is a deficient number, since it is larger than the sum of its proper divisors (23233353).

138356407 is a wasteful number, since it uses less digits than its factorization.

138356407 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2110.

The product of its (nonzero) digits is 60480, while the sum is 37.

The square root of 138356407 is about 11762.5000318810. The cubic root of 138356407 is about 517.2094187313.

The spelling of 138356407 in words is "one hundred thirty-eight million, three hundred fifty-six thousand, four hundred seven".