138217625 has 64 divisors (see below), whose sum is σ = 220147200. Its totient is φ = 84268800.

The previous prime is 138217621. The next prime is 138217627. The reversal of 138217625 is 526712831.

It is a happy number.

It is not a de Polignac number, because 138217625 - 2² = 138217621 is a prime.

It is a super-2 number, since 2×138217625² = 38208223721281250, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is not an unprimeable number, because it can be changed into a prime (138217621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 329666 + ... + 330084.

It is an arithmetic number, because the mean of its divisors is an integer number (3439800).

Almost surely, 2^138217625 is an apocalyptic number.

It is an amenable number.

138217625 is a deficient number, since it is larger than the sum of its proper divisors (81929575).

138217625 is a wasteful number, since it uses less digits than its factorization.

138217625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 483 (or 473 counting only the distinct ones).

The product of its digits is 20160, while the sum is 35.

The square root of 138217625 is about 11756.5992106561. The cubic root of 138217625 is about 517.0364274148.

The spelling of 138217625 in words is "one hundred thirty-eight million, two hundred seventeen thousand, six hundred twenty-five".