2155572 has 30 divisors (see below), whose sum is σ = 5635938. Its totient is φ = 718416.

The previous prime is 2155519. The next prime is 2155579. The reversal of 2155572 is 2755512.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 1245456 + 910116 = 1116^2 + 954^2 .

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a zygodrome in base 3.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2155579) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 3003 + ... + 3650.

2^2155572 is an apocalyptic number.

It is an amenable number.

2155572 is an abundant number, since it is smaller than the sum of its proper divisors (3480366).

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

2155572 is a wasteful number, since it uses less digits than its factorization.

2155572 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6669 (or 6658 counting only the distinct ones).

The product of its digits is 3500, while the sum is 27.

The square root of 2155572 is about 1468.1866366372. The cubic root of 2155572 is about 129.1776891507.

The spelling of 2155572 in words is "two million, one hundred fifty-five thousand, five hundred seventy-two".