2157445 has 12 divisors (see below), whose sum is σ = 2681100. Its totient is φ = 1666560.

The previous prime is 2157427. The next prime is 2157451. The reversal of 2157445 is 5447512.

It can be written as a sum of positive squares in 2 ways, for example, as 1046529 + 1110916 = 1023^2 + 1054^2 .

It is not a de Polignac number, because 2157445 - 2⁵ = 2157413 is a prime.

It is a congruent 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, 4581 + ... + 5029.

It is an arithmetic number, because the mean of its divisors is an integer number (223425).

2^2157445 is an apocalyptic number.

It is an amenable number.

2157445 is a deficient number, since it is larger than the sum of its proper divisors (523655).

2157445 is an equidigital number, since it uses as much as digits as its factorization.

2157445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 516 (or 485 counting only the distinct ones).

The product of its digits is 5600, while the sum is 28.

The square root of 2157445 is about 1468.8243598198. The cubic root of 2157445 is about 129.2150929532.

The spelling of 2157445 in words is "two million, one hundred fifty-seven thousand, four hundred forty-five".