2155830 has 16 divisors (see below), whose sum is σ = 5174064. Its totient is φ = 574880.

The previous prime is 2155799. The next prime is 2155837. The reversal of 2155830 is 385512.

It is a self number, because there is not a number n which added to its sum of digits gives 2155830.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2155837) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35901 + ... + 35960.

It is an arithmetic number, because the mean of its divisors is an integer number (323379).

2^2155830 is an apocalyptic number.

2155830 is an abundant number, since it is smaller than the sum of its proper divisors (3018234).

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

2155830 is a wasteful number, since it uses less digits than its factorization.

2155830 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71871.

The product of its (nonzero) digits is 1200, while the sum is 24.

The square root of 2155830 is about 1468.2744974970. The cubic root of 2155830 is about 129.1828426961.

The spelling of 2155830 in words is "two million, one hundred fifty-five thousand, eight hundred thirty".