2155902 has 24 divisors (see below), whose sum is σ = 5016456. Its totient is φ = 615888.

The previous prime is 2155883. The next prime is 2155931. The reversal of 2155902 is 2095512.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3373 + ... + 3960.

It is an arithmetic number, because the mean of its divisors is an integer number (209019).

2^2155902 is an apocalyptic number.

2155902 is an abundant number, since it is smaller than the sum of its proper divisors (2860554).

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

2155902 is a wasteful number, since it uses less digits than its factorization.

2155902 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7352 (or 7345 counting only the distinct ones).

The product of its (nonzero) digits is 900, while the sum is 24.

The square root of 2155902 is about 1468.2990158684. The cubic root of 2155902 is about 129.1842808214.

Adding to 2155902 its sum of digits (24), we get a triangular number (2155926 = T₂₀₇₆).

The spelling of 2155902 in words is "two million, one hundred fifty-five thousand, nine hundred two".