2155240 has 16 divisors (see below), whose sum is σ = 4849380. Its totient is φ = 862080.

The previous prime is 2155207. The next prime is 2155253. The reversal of 2155240 is 425512.

2155240 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 2149156 + 6084 = 1466^2 + 78^2 .

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, 26901 + ... + 26980.

2^2155240 is an apocalyptic number.

2155240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2155240 is an abundant number, since it is smaller than the sum of its proper divisors (2694140).

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

2155240 is a wasteful number, since it uses less digits than its factorization.

2155240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53892 (or 53888 counting only the distinct ones).

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

The square root of 2155240 is about 1468.0735676389. The cubic root of 2155240 is about 129.1710568516.

The spelling of 2155240 in words is "two million, one hundred fifty-five thousand, two hundred forty".