2090857 has 4 divisors (see below), whose sum is σ = 2158336. Its totient is φ = 2023380.

The previous prime is 2090849. The next prime is 2090863. The reversal of 2090857 is 7580902.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2090857 - 2³ = 2090849 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31), and also a Moran number because the ratio is a prime number: 67447 = 2090857 / (2 + 0 + 9 + 0 + 8 + 5 + 7).

It is a Duffinian number.

2090857 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (2090807) 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, 33693 + ... + 33754.

It is an arithmetic number, because the mean of its divisors is an integer number (539584).

2^2090857 is an apocalyptic number.

It is an amenable number.

2090857 is a deficient number, since it is larger than the sum of its proper divisors (67479).

2090857 is an equidigital number, since it uses as much as digits as its factorization.

2090857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67478.

The product of its (nonzero) digits is 5040, while the sum is 31.

The square root of 2090857 is about 1445.9795987496. The cubic root of 2090857 is about 127.8717995388.

The spelling of 2090857 in words is "two million, ninety thousand, eight hundred fifty-seven".