138589488 has 80 divisors (see below), whose sum is σ = 405375840. Its totient is φ = 45317376.

The previous prime is 138589453. The next prime is 138589501. The reversal of 138589488 is 884985831.

138589488 is a `hidden beast` number, since 1 + 3 + 85 + 89 + 488 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19870 + ... + 25922.

It is an arithmetic number, because the mean of its divisors is an integer number (5067198).

Almost surely, 2^138589488 is an apocalyptic number.

138589488 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 138589488, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (202687920).

138589488 is an abundant number, since it is smaller than the sum of its proper divisors (266786352).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

138589488 is a wasteful number, since it uses less digits than its factorization.

138589488 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6123 (or 6111 counting only the distinct ones).

The product of its digits is 2211840, while the sum is 54.

The square root of 138589488 is about 11772.4036628040. The cubic root of 138589488 is about 517.4996933416.

The spelling of 138589488 in words is "one hundred thirty-eight million, five hundred eighty-nine thousand, four hundred eighty-eight".