138564399 has 16 divisors (see below), whose sum is σ = 196017408. Its totient is φ = 86765952.

The previous prime is 138564383. The next prime is 138564457. The reversal of 138564399 is 993465831.

It is not a de Polignac number, because 138564399 - 2⁴ = 138564383 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138564799) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25414 + ... + 30380.

It is an arithmetic number, because the mean of its divisors is an integer number (12251088).

Almost surely, 2^138564399 is an apocalyptic number.

138564399 is a deficient number, since it is larger than the sum of its proper divisors (57453009).

138564399 is a wasteful number, since it uses less digits than its factorization.

138564399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5534.

The product of its digits is 699840, while the sum is 48.

The square root of 138564399 is about 11771.3380292981. The cubic root of 138564399 is about 517.4684636200.

The spelling of 138564399 in words is "one hundred thirty-eight million, five hundred sixty-four thousand, three hundred ninety-nine".