2155244 has 48 divisors (see below), whose sum is σ = 4816896. Its totient is φ = 820800.

The previous prime is 2155207. The next prime is 2155253. The reversal of 2155244 is 4425512.

2155244 = T₁₉₅ + T₁₉₆ + ... + T₂₇₂.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11189 + ... + 11379.

It is an arithmetic number, because the mean of its divisors is an integer number (100352).

2^2155244 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 2155244, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2408448).

2155244 is an abundant number, since it is smaller than the sum of its proper divisors (2661652).

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

2155244 is a wasteful number, since it uses less digits than its factorization.

2155244 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 246 (or 244 counting only the distinct ones).

The product of its digits is 1600, while the sum is 23.

The square root of 2155244 is about 1468.0749299678. The cubic root of 2155244 is about 129.1711367629.

The spelling of 2155244 in words is "two million, one hundred fifty-five thousand, two hundred forty-four".