2557998 has 12 divisors (see below), whose sum is σ = 5542368. Its totient is φ = 852660.

The previous prime is 2557967. The next prime is 2557999. The reversal of 2557998 is 8997552.

It is a happy number.

2557998 is a `hidden beast` number, since 2 + 557 + 9 + 98 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2557999) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 71038 + ... + 71073.

It is an arithmetic number, because the mean of its divisors is an integer number (461864).

2^2557998 is an apocalyptic number.

2557998 is an abundant number, since it is smaller than the sum of its proper divisors (2984370).

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

2557998 is a wasteful number, since it uses less digits than its factorization.

2557998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142119 (or 142116 counting only the distinct ones).

The product of its digits is 226800, while the sum is 45.

The square root of 2557998 is about 1599.3742526376. The cubic root of 2557998 is about 136.7624063109.

The spelling of 2557998 in words is "two million, five hundred fifty-seven thousand, nine hundred ninety-eight".