138924660 has 144 divisors (see below), whose sum is σ = 458752896. Its totient is φ = 30760704.

The previous prime is 138924659. The next prime is 138924679. The reversal of 138924660 is 66429831.

It is a super-2 number, since 2×138924660² = 38600122312231200, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1758501 + ... + 1758579.

It is an arithmetic number, because the mean of its divisors is an integer number (3185784).

Almost surely, 2^138924660 is an apocalyptic number.

138924660 is a gapful number since it is divisible by the number (10) 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 138924660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (229376448).

138924660 is an abundant number, since it is smaller than the sum of its proper divisors (319828236).

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

138924660 is a wasteful number, since it uses less digits than its factorization.

138924660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 230 (or 149 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 39.

The square root of 138924660 is about 11786.6305617848. The cubic root of 138924660 is about 517.9165401730.

The spelling of 138924660 in words is "one hundred thirty-eight million, nine hundred twenty-four thousand, six hundred sixty".