2157530 has 8 divisors (see below), whose sum is σ = 3883572. Its totient is φ = 863008.

The previous prime is 2157527. The next prime is 2157539. The reversal of 2157530 is 357512.

It can be written as a sum of positive squares in 2 ways, for example, as 2140369 + 17161 = 1463^2 + 131^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 2157496 and 2157505.

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 3 ways as a sum of consecutive naturals, for example, 107867 + ... + 107886.

2^2157530 is an apocalyptic number.

2157530 is a deficient number, since it is larger than the sum of its proper divisors (1726042).

2157530 is a wasteful number, since it uses less digits than its factorization.

2157530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 215760.

The product of its (nonzero) digits is 1050, while the sum is 23.

The square root of 2157530 is about 1468.8532942401. The cubic root of 2157530 is about 129.2167898893.

The spelling of 2157530 in words is "two million, one hundred fifty-seven thousand, five hundred thirty".