3157220 has 48 divisors (see below), whose sum is σ = 7354368. Its totient is φ = 1128960.

The previous prime is 3157213. The next prime is 3157229. The reversal of 3157220 is 227513.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 3157192 and 3157201.

It is not an unprimeable number, because it can be changed into a prime (3157229) 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, 24797 + ... + 24923.

It is an arithmetic number, because the mean of its divisors is an integer number (153216).

Almost surely, 2^3157220 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 3157220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3677184).

3157220 is an abundant number, since it is smaller than the sum of its proper divisors (4197148).

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

3157220 is a wasteful number, since it uses less digits than its factorization.

3157220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 260 (or 258 counting only the distinct ones).

The product of its (nonzero) digits is 420, while the sum is 20.

The square root of 3157220 is about 1776.8567753198. The cubic root of 3157220 is about 146.7016330772.

The spelling of 3157220 in words is "three million, one hundred fifty-seven thousand, two hundred twenty".