2153820 has 24 divisors (see below), whose sum is σ = 6030864. Its totient is φ = 574336.

The previous prime is 2153819. The next prime is 2153839. The reversal of 2153820 is 283512.

2153820 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17889 + ... + 18008.

It is an arithmetic number, because the mean of its divisors is an integer number (251286).

2^2153820 is an apocalyptic number.

2153820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2153820 is an abundant number, since it is smaller than the sum of its proper divisors (3877044).

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

2153820 is a wasteful number, since it uses less digits than its factorization.

2153820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35909 (or 35907 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 21.

The square root of 2153820 is about 1467.5898609625. The cubic root of 2153820 is about 129.1426821000.

The spelling of 2153820 in words is "two million, one hundred fifty-three thousand, eight hundred twenty".