138818370 has 64 divisors (see below), whose sum is σ = 352512000. Its totient is φ = 34888896.

The previous prime is 138818359. The next prime is 138818387. The reversal of 138818370 is 73818831.

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, 135721 + ... + 136739.

It is an arithmetic number, because the mean of its divisors is an integer number (5508000).

Almost surely, 2^138818370 is an apocalyptic number.

138818370 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 138818370, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (176256000).

138818370 is an abundant number, since it is smaller than the sum of its proper divisors (213693630).

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

138818370 is a wasteful number, since it uses less digits than its factorization.

138818370 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1287.

The product of its (nonzero) digits is 32256, while the sum is 39.

The square root of 138818370 is about 11782.1207768381. The cubic root of 138818370 is about 517.7844220540.

The spelling of 138818370 in words is "one hundred thirty-eight million, eight hundred eighteen thousand, three hundred seventy".