2157285 has 48 divisors (see below), whose sum is σ = 4005504. Its totient is φ = 988416.

The previous prime is 2157277. The next prime is 2157293. The reversal of 2157285 is 5827512.

2157285 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (2157277) and next prime (2157293).

It is not a de Polignac number, because 2157285 - 2³ = 2157277 is a prime.

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 47 ways as a sum of consecutive naturals, for example, 58287 + ... + 58323.

It is an arithmetic number, because the mean of its divisors is an integer number (83448).

2^2157285 is an apocalyptic number.

It is an amenable number.

2157285 is a deficient number, since it is larger than the sum of its proper divisors (1848219).

2157285 is a wasteful number, since it uses less digits than its factorization.

2157285 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94 (or 81 counting only the distinct ones).

The product of its digits is 5600, while the sum is 30.

The square root of 2157285 is about 1468.7698934823. The cubic root of 2157285 is about 129.2118985997.

It can be divided in two parts, 2157 and 285, that added together give a palindrome (2442).

The spelling of 2157285 in words is "two million, one hundred fifty-seven thousand, two hundred eighty-five".