2155930 has 32 divisors (see below), whose sum is σ = 4671360. Its totient is φ = 699840.

The previous prime is 2155883. The next prime is 2155931. The reversal of 2155930 is 395512.

It is a junction number, because it is equal to n+sod(n) for n = 2155895 and 2155904.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2155931) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 520 + ... + 2140.

It is an arithmetic number, because the mean of its divisors is an integer number (145980).

2^2155930 is an apocalyptic number.

2155930 is an abundant number, since it is smaller than the sum of its proper divisors (2515430).

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

2155930 is a wasteful number, since it uses less digits than its factorization.

2155930 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1654.

The product of its (nonzero) digits is 1350, while the sum is 25.

The square root of 2155930 is about 1468.3085506800. The cubic root of 2155930 is about 129.1848400837.

The spelling of 2155930 in words is "two million, one hundred fifty-five thousand, nine hundred thirty".