138233220 has 48 divisors (see below), whose sum is σ = 403885440. Its totient is φ = 35259136.

The previous prime is 138233209. The next prime is 138233233. The reversal of 138233220 is 22332831.

It is a super-2 number, since 2×138233220² = 38216846223136800, which contains 22 as substring.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 48705 + ... + 51464.

It is an arithmetic number, because the mean of its divisors is an integer number (8414280).

Almost surely, 2^138233220 is an apocalyptic number.

138233220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

138233220 is an abundant number, since it is smaller than the sum of its proper divisors (265652220).

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

138233220 is a wasteful number, since it uses less digits than its factorization.

138233220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100204 (or 100202 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 24.

The square root of 138233220 is about 11757.2624364688. The cubic root of 138233220 is about 517.0558723056.

The spelling of 138233220 in words is "one hundred thirty-eight million, two hundred thirty-three thousand, two hundred twenty".