2130645 has 32 divisors (see below), whose sum is σ = 3830400. Its totient is φ = 1002240.

The previous prime is 2130631. The next prime is 2130671. The reversal of 2130645 is 5460312.

It is a happy number.

It is not a de Polignac number, because 2130645 - 2⁵ = 2130613 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5931 + ... + 6279.

It is an arithmetic number, because the mean of its divisors is an integer number (119700).

2^2130645 is an apocalyptic number.

It is an amenable number.

2130645 is a deficient number, since it is larger than the sum of its proper divisors (1699755).

2130645 is a wasteful number, since it uses less digits than its factorization.

2130645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 405.

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 2130645 is about 1459.6729085655. The cubic root of 2130645 is about 128.6778211072.

Adding to 2130645 its reverse (5460312), we get a palindrome (7590957).

It can be divided in two parts, 2130 and 645, that added together give a triangular number (2775 = T₇₄).

The spelling of 2130645 in words is "two million, one hundred thirty thousand, six hundred forty-five".