138858565 has 16 divisors (see below), whose sum is σ = 170035200. Its totient is φ = 108830272.

The previous prime is 138858563. The next prime is 138858589. The reversal of 138858565 is 565858831.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 138858565 - 2¹ = 138858563 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138858563) 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, 112371 + ... + 113599.

It is an arithmetic number, because the mean of its divisors is an integer number (10627200).

Almost surely, 2^138858565 is an apocalyptic number.

It is an amenable number.

138858565 is a deficient number, since it is larger than the sum of its proper divisors (31176635).

138858565 is a wasteful number, since it uses less digits than its factorization.

138858565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1676.

The product of its digits is 1152000, while the sum is 49.

The square root of 138858565 is about 11783.8264158973. The cubic root of 138858565 is about 517.8343922331.

The spelling of 138858565 in words is "one hundred thirty-eight million, eight hundred fifty-eight thousand, five hundred sixty-five".