33138220 has 12 divisors (see below), whose sum is σ = 69590304. Its totient is φ = 13255280.

The previous prime is 33138211. The next prime is 33138241. The reversal of 33138220 is 2283133.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 33138191 and 33138200.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 828436 + ... + 828475.

It is an arithmetic number, because the mean of its divisors is an integer number (5799192).

Almost surely, 2^33138220 is an apocalyptic number.

It is an amenable number.

33138220 is an abundant number, since it is smaller than the sum of its proper divisors (36452084).

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

33138220 is a wasteful number, since it uses less digits than its factorization.

33138220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1656920 (or 1656918 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 22.

The square root of 33138220 is about 5756.5805822554. The cubic root of 33138220 is about 321.2006328477.

The spelling of 33138220 in words is "thirty-three million, one hundred thirty-eight thousand, two hundred twenty".