2157385 has 12 divisors (see below), whose sum is σ = 2751948. Its totient is φ = 1623296.

The previous prime is 2157361. The next prime is 2157391. The reversal of 2157385 is 5837512.

It can be written as a sum of positive squares in 6 ways, for example, as 383161 + 1774224 = 619^2 + 1332^2 .

It is not a de Polignac number, because 2157385 - 2⁷ = 2157257 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 699 + ... + 2191.

It is an arithmetic number, because the mean of its divisors is an integer number (229329).

2^2157385 is an apocalyptic number.

It is an amenable number.

2157385 is a deficient number, since it is larger than the sum of its proper divisors (594563).

2157385 is a wasteful number, since it uses less digits than its factorization.

2157385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1532 (or 1515 counting only the distinct ones).

The product of its digits is 8400, while the sum is 31.

The square root of 2157385 is about 1468.8039351799. The cubic root of 2157385 is about 129.2138950891.

The spelling of 2157385 in words is "two million, one hundred fifty-seven thousand, three hundred eighty-five".