138786489 has 48 divisors (see below), whose sum is σ = 215654400. Its totient is φ = 85857408.

The previous prime is 138786463. The next prime is 138786491. The reversal of 138786489 is 984687831.

138786489 is a `hidden beast` number, since 1 + 3 + 87 + 86 + 489 = 666.

138786489 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 138786489 - 2⁵ = 138786457 is a prime.

It is not an unprimeable number, because it can be changed into a prime (138785489) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1092744 + ... + 1092870.

It is an arithmetic number, because the mean of its divisors is an integer number (4492800).

Almost surely, 2^138786489 is an apocalyptic number.

It is an amenable number.

138786489 is a deficient number, since it is larger than the sum of its proper divisors (76867911).

138786489 is a wasteful number, since it uses less digits than its factorization.

138786489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 294 (or 291 counting only the distinct ones).

The product of its digits is 2322432, while the sum is 54.

The square root of 138786489 is about 11780.7677593610. The cubic root of 138786489 is about 517.7447809291.

The spelling of 138786489 in words is "one hundred thirty-eight million, seven hundred eighty-six thousand, four hundred eighty-nine".