2157489 has 8 divisors (see below), whose sum is σ = 3196320. Its totient is φ = 1438308.

The previous prime is 2157481. The next prime is 2157499. The reversal of 2157489 is 9847512.

2157489 is a `hidden beast` number, since 2 + 1 + 574 + 89 = 666.

2157489 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 2157489 - 2³ = 2157481 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2157481) by changing a digit.

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, 39927 + ... + 39980.

It is an arithmetic number, because the mean of its divisors is an integer number (399540).

2^2157489 is an apocalyptic number.

It is an amenable number.

2157489 is a deficient number, since it is larger than the sum of its proper divisors (1038831).

2157489 is an equidigital number, since it uses as much as digits as its factorization.

2157489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79916 (or 79910 counting only the distinct ones).

The product of its digits is 20160, while the sum is 36.

The square root of 2157489 is about 1468.8393377085. The cubic root of 2157489 is about 129.2159713727.

The spelling of 2157489 in words is "two million, one hundred fifty-seven thousand, four hundred eighty-nine".