138223332 has 72 divisors (see below), whose sum is σ = 378041664. Its totient is φ = 42330816.

The previous prime is 138223331. The next prime is 138223361. The reversal of 138223332 is 233322831.

138223332 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 138223296 and 138223305.

It is not an unprimeable number, because it can be changed into a prime (138223331) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 122523 + ... + 123645.

Almost surely, 2^138223332 is an apocalyptic number.

138223332 is a gapful number since it is divisible by the number (12) 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 138223332, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (189020832).

138223332 is an abundant number, since it is smaller than the sum of its proper divisors (239818332).

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

138223332 is a wasteful number, since it uses less digits than its factorization.

138223332 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1409 (or 1404 counting only the distinct ones).

The product of its digits is 5184, while the sum is 27.

The square root of 138223332 is about 11756.8419228975. The cubic root of 138223332 is about 517.0435434544.

The spelling of 138223332 in words is "one hundred thirty-eight million, two hundred twenty-three thousand, three hundred thirty-two".