138597976 has 32 divisors (see below), whose sum is σ = 285223680. Its totient is φ = 62615200.

The previous prime is 138597973. The next prime is 138597997. The reversal of 138597976 is 679795831.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138597973) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9981 + ... + 19411.

It is an arithmetic number, because the mean of its divisors is an integer number (8913240).

Almost surely, 2^138597976 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 138597976, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (142611840).

138597976 is an abundant number, since it is smaller than the sum of its proper divisors (146625704).

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

138597976 is a wasteful number, since it uses less digits than its factorization.

138597976 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9615 (or 9611 counting only the distinct ones).

The product of its digits is 2857680, while the sum is 55.

The square root of 138597976 is about 11772.7641614024. The cubic root of 138597976 is about 517.5102579902.

The spelling of 138597976 in words is "one hundred thirty-eight million, five hundred ninety-seven thousand, nine hundred seventy-six".