2557869 has 4 divisors (see below), whose sum is σ = 3410496. Its totient is φ = 1705244.

The previous prime is 2557861. The next prime is 2557879. The reversal of 2557869 is 9687552.

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 2557869 - 2³ = 2557861 is a prime.

It is a super-2 number, since 2×2557869² = 13085387642322, which contains 22 as substring.

It is a D-number.

2557869 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 2557869.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2557861) 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, 426309 + ... + 426314.

It is an arithmetic number, because the mean of its divisors is an integer number (852624).

2^2557869 is an apocalyptic number.

It is an amenable number.

2557869 is a deficient number, since it is larger than the sum of its proper divisors (852627).

2557869 is an equidigital number, since it uses as much as digits as its factorization.

2557869 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 852626.

The product of its digits is 151200, while the sum is 42.

The square root of 2557869 is about 1599.3339238571. Note that the first 3 decimals coincide. The cubic root of 2557869 is about 136.7601072934.

The spelling of 2557869 in words is "two million, five hundred fifty-seven thousand, eight hundred sixty-nine".