2155122 has 24 divisors (see below), whose sum is σ = 4741776. Its totient is φ = 707256.

The previous prime is 2155121. The next prime is 2155129. The reversal of 2155122 is 2215512.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 2155095 and 2155104.

It is not an unprimeable number, because it can be changed into a prime (2155121) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 313 + ... + 2099.

It is an arithmetic number, because the mean of its divisors is an integer number (197574).

2^2155122 is an apocalyptic number.

2155122 is an abundant number, since it is smaller than the sum of its proper divisors (2586654).

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

2155122 is a wasteful number, since it uses less digits than its factorization.

2155122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1862 (or 1859 counting only the distinct ones).

The product of its digits is 200, while the sum is 18.

The square root of 2155122 is about 1468.0333783671. The cubic root of 2155122 is about 129.1686994246.

The spelling of 2155122 in words is "two million, one hundred fifty-five thousand, one hundred twenty-two".