2157579 has 6 divisors (see below), whose sum is σ = 3116516. Its totient is φ = 1438380.

The previous prime is 2157563. The next prime is 2157587. The reversal of 2157579 is 9757512.

It is not a de Polignac number, because 2157579 - 2⁴ = 2157563 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2157539) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 119857 + ... + 119874.

2^2157579 is an apocalyptic number.

2157579 is a deficient number, since it is larger than the sum of its proper divisors (958937).

2157579 is a wasteful number, since it uses less digits than its factorization.

2157579 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 239737 (or 239734 counting only the distinct ones).

The product of its digits is 22050, while the sum is 36.

The square root of 2157579 is about 1468.8699738234. The cubic root of 2157579 is about 129.2177681027.

It can be divided in two parts, 21 and 57579, that added together give a square (57600 = 240²).

The spelling of 2157579 in words is "two million, one hundred fifty-seven thousand, five hundred seventy-nine".