138363660 has 96 divisors (see below), whose sum is σ = 432573120. Its totient is φ = 36716544.

The previous prime is 138363649. The next prime is 138363679. The reversal of 138363660 is 66363831.

138363660 is a `hidden beast` number, since 13 + 8 + 3 + 636 + 6 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 138282 + ... + 139278.

It is an arithmetic number, because the mean of its divisors is an integer number (4505970).

Almost surely, 2^138363660 is an apocalyptic number.

138363660 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 138363660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (216286560).

138363660 is an abundant number, since it is smaller than the sum of its proper divisors (294209460).

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

138363660 is a wasteful number, since it uses less digits than its factorization.

138363660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1272 (or 1264 counting only the distinct ones).

The product of its (nonzero) digits is 46656, while the sum is 36.

The square root of 138363660 is about 11762.8083381478. The cubic root of 138363660 is about 517.2184563910.

The spelling of 138363660 in words is "one hundred thirty-eight million, three hundred sixty-three thousand, six hundred sixty".