4155220 has 24 divisors (see below), whose sum is σ = 8765064. Its totient is φ = 1654656.

The previous prime is 4155197. The next prime is 4155247. The reversal of 4155220 is 225514.

It can be written as a sum of positive squares in 4 ways, for example, as 42436 + 4112784 = 206^2 + 2028^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7182 + ... + 7738.

It is an arithmetic number, because the mean of its divisors is an integer number (365211).

Almost surely, 2^4155220 is an apocalyptic number.

It is an amenable number.

4155220 is an abundant number, since it is smaller than the sum of its proper divisors (4609844).

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

4155220 is a wasteful number, since it uses less digits than its factorization.

4155220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 939 (or 937 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 19.

The square root of 4155220 is about 2038.4356747271. The cubic root of 4155220 is about 160.7674071545.

The spelling of 4155220 in words is "four million, one hundred fifty-five thousand, two hundred twenty".