138547989 has 40 divisors (see below), whose sum is σ = 214837920. Its totient is φ = 88923744.

The previous prime is 138547973. The next prime is 138548023. The reversal of 138547989 is 989745831.

138547989 is a `hidden beast` number, since 1 + 3 + 8 + 547 + 98 + 9 = 666.

It is not a de Polignac number, because 138547989 - 2⁴ = 138547973 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138547949) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 253014 + ... + 253560.

It is an arithmetic number, because the mean of its divisors is an integer number (5370948).

Almost surely, 2^138547989 is an apocalyptic number.

It is an amenable number.

138547989 is a deficient number, since it is larger than the sum of its proper divisors (76289931).

138547989 is an equidigital number, since it uses as much as digits as its factorization.

138547989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 671 (or 662 counting only the distinct ones).

The product of its digits is 2177280, while the sum is 54.

The square root of 138547989 is about 11770.6409765994. The cubic root of 138547989 is about 517.4480351098.

The spelling of 138547989 in words is "one hundred thirty-eight million, five hundred forty-seven thousand, nine hundred eighty-nine".