138090220 has 36 divisors (see below), whose sum is σ = 292887504. Its totient is φ = 54688960.

The previous prime is 138090217. The next prime is 138090259. The reversal of 138090220 is 22090831.

138090220 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 443865 + ... + 444175.

It is an arithmetic number, because the mean of its divisors is an integer number (8135764).

Almost surely, 2^138090220 is an apocalyptic number.

138090220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

138090220 is an abundant number, since it is smaller than the sum of its proper divisors (154797284).

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

138090220 is a wasteful number, since it uses less digits than its factorization.

138090220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 618 (or 467 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 138090220 is about 11751.1795152657. The cubic root of 138090220 is about 516.8775155145.

The spelling of 138090220 in words is "one hundred thirty-eight million, ninety thousand, two hundred twenty".