2153845 has 4 divisors (see below), whose sum is σ = 2584620. Its totient is φ = 1723072.

The previous prime is 2153839. The next prime is 2153861. The reversal of 2153845 is 5483512.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 285156 + 1868689 = 534^2 + 1367^2 .

It is a cyclic number.

It is not a de Polignac number, because 2153845 - 2⁵ = 2153813 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 215380 + ... + 215389.

It is an arithmetic number, because the mean of its divisors is an integer number (646155).

2^2153845 is an apocalyptic number.

It is an amenable number.

2153845 is a deficient number, since it is larger than the sum of its proper divisors (430775).

2153845 is an equidigital number, since it uses as much as digits as its factorization.

2153845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 430774.

The product of its digits is 4800, while the sum is 28.

The square root of 2153845 is about 1467.5983783038. The cubic root of 2153845 is about 129.1431817633.

The spelling of 2153845 in words is "two million, one hundred fifty-three thousand, eight hundred forty-five".