138258549 has 32 divisors (see below), whose sum is σ = 240643200. Its totient is φ = 77345280.

The previous prime is 138258541. The next prime is 138258553. The reversal of 138258549 is 945852831.

138258549 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 138258549 - 2³ = 138258541 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138258541) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 14044 + ... + 21765.

It is an arithmetic number, because the mean of its divisors is an integer number (7520100).

Almost surely, 2^138258549 is an apocalyptic number.

It is an amenable number.

138258549 is a deficient number, since it is larger than the sum of its proper divisors (102384651).

138258549 is a wasteful number, since it uses less digits than its factorization.

138258549 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35842 (or 35836 counting only the distinct ones).

The product of its digits is 345600, while the sum is 45.

The square root of 138258549 is about 11758.3395511441. The cubic root of 138258549 is about 517.0874510832.

The spelling of 138258549 in words is "one hundred thirty-eight million, two hundred fifty-eight thousand, five hundred forty-nine".