2157775 has 6 divisors (see below), whose sum is σ = 2675672. Its totient is φ = 1726200.

The previous prime is 2157769. The next prime is 2157787. The reversal of 2157775 is 5777512.

It is not a de Polignac number, because 2157775 - 2³ = 2157767 is a prime.

It is a Duffinian number.

2157775 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 2157775.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 43131 + ... + 43180.

2^2157775 is an apocalyptic number.

2157775 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

2157775 is a deficient number, since it is larger than the sum of its proper divisors (517897).

2157775 is an equidigital number, since it uses as much as digits as its factorization.

2157775 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86321 (or 86316 counting only the distinct ones).

The product of its digits is 17150, while the sum is 34.

The square root of 2157775 is about 1468.9366902627. The cubic root of 2157775 is about 129.2216808085.

The spelling of 2157775 in words is "two million, one hundred fifty-seven thousand, seven hundred seventy-five".