9138220 has 48 divisors (see below), whose sum is σ = 23623488. Its totient is φ = 2891520.

The previous prime is 9138209. The next prime is 9138229. The reversal of 9138220 is 228319.

It is not an unprimeable number, because it can be changed into a prime (9138229) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 691 + ... + 4330.

It is an arithmetic number, because the mean of its divisors is an integer number (492156).

Almost surely, 2^9138220 is an apocalyptic number.

It is an amenable number.

9138220 is an abundant number, since it is smaller than the sum of its proper divisors (14485268).

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

9138220 is a wasteful number, since it uses less digits than its factorization.

9138220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5050 (or 5048 counting only the distinct ones).

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

The square root of 9138220 is about 3022.9488913973. The cubic root of 9138220 is about 209.0678259446.

The spelling of 9138220 in words is "nine million, one hundred thirty-eight thousand, two hundred twenty".