2151860 has 24 divisors (see below), whose sum is σ = 4785480. Its totient is φ = 809984.

The previous prime is 2151847. The next prime is 2151869. The reversal of 2151860 is 681512.

It can be written as a sum of positive squares in 4 ways, for example, as 702244 + 1449616 = 838^2 + 1204^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2151869) 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, 2825 + ... + 3504.

It is an arithmetic number, because the mean of its divisors is an integer number (199395).

2^2151860 is an apocalyptic number.

2151860 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2151860 is an abundant number, since it is smaller than the sum of its proper divisors (2633620).

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

2151860 is a wasteful number, since it uses less digits than its factorization.

2151860 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6355 (or 6353 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 23.

The square root of 2151860 is about 1466.9219474805. The cubic root of 2151860 is about 129.1034964552.

The spelling of 2151860 in words is "two million, one hundred fifty-one thousand, eight hundred sixty".