138764549 has 8 divisors (see below), whose sum is σ = 173005248. Its totient is φ = 108128160.

The previous prime is 138764537. The next prime is 138764551. The reversal of 138764549 is 945467831.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 138764549 - 2¹⁶ = 138699013 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138764749) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 900992 + ... + 901145.

It is an arithmetic number, because the mean of its divisors is an integer number (21625656).

Almost surely, 2^138764549 is an apocalyptic number.

It is an amenable number.

138764549 is a deficient number, since it is larger than the sum of its proper divisors (34240699).

138764549 is a wasteful number, since it uses less digits than its factorization.

138764549 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1802155.

The product of its digits is 725760, while the sum is 47.

The square root of 138764549 is about 11779.8365438575. The cubic root of 138764549 is about 517.7174970074.

The spelling of 138764549 in words is "one hundred thirty-eight million, seven hundred sixty-four thousand, five hundred forty-nine".