2557993 has 8 divisors (see below), whose sum is σ = 2636768. Its totient is φ = 2480544.

The previous prime is 2557967. The next prime is 2557999. The reversal of 2557993 is 3997552.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2557993 - 2¹³ = 2549801 is a prime.

It is an Ulam number.

It is a Duffinian 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 7 ways as a sum of consecutive naturals, for example, 4630 + ... + 5152.

It is an arithmetic number, because the mean of its divisors is an integer number (329596).

2^2557993 is an apocalyptic number.

It is an amenable number.

2557993 is a deficient number, since it is larger than the sum of its proper divisors (78775).

2557993 is an equidigital number, since it uses as much as digits as its factorization.

2557993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 663.

The product of its digits is 85050, while the sum is 40.

The square root of 2557993 is about 1599.3726895255. The cubic root of 2557993 is about 136.7623172032.

The spelling of 2557993 in words is "two million, five hundred fifty-seven thousand, nine hundred ninety-three".