2557830 has 64 divisors (see below), whose sum is σ = 7008768. Its totient is φ = 591360.

The previous prime is 2557823. The next prime is 2557843. The reversal of 2557830 is 387552.

It is a happy number.

It is a Smith number, since the sum of its digits (30) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7422 + ... + 7758.

It is an arithmetic number, because the mean of its divisors is an integer number (109512).

2^2557830 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2557830, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3504384).

2557830 is an abundant number, since it is smaller than the sum of its proper divisors (4450938).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2557830 is a wasteful number, since it uses less digits than its factorization.

2557830 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 381.

The product of its (nonzero) digits is 8400, while the sum is 30.

The square root of 2557830 is about 1599.3217312348. The cubic root of 2557830 is about 136.7594122263.

The spelling of 2557830 in words is "two million, five hundred fifty-seven thousand, eight hundred thirty".