138817800 has 480 divisors, whose sum is σ = 567151200. Its totient is φ = 31104000.

The previous prime is 138817793. The next prime is 138817807. The reversal of 138817800 is 8718831.

It is an interprime number because it is at equal distance from previous prime (138817793) and next prime (138817807).

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

It is not an unprimeable number, because it can be changed into a prime (138817807) by changing a digit.

It is a polite number, since it can be written in 119 ways as a sum of consecutive naturals, for example, 3385780 + ... + 3385820.

It is an arithmetic number, because the mean of its divisors is an integer number (1181565).

Almost surely, 2^138817800 is an apocalyptic number.

138817800 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 138817800, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (283575600).

138817800 is an abundant number, since it is smaller than the sum of its proper divisors (428333400).

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

138817800 is a wasteful number, since it uses less digits than its factorization.

138817800 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99 (or 81 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 36.

The square root of 138817800 is about 11782.0965876197. The cubic root of 138817800 is about 517.7837133641.

The spelling of 138817800 in words is "one hundred thirty-eight million, eight hundred seventeen thousand, eight hundred".