2557990 has 32 divisors (see below), whose sum is σ = 5007744. Its totient is φ = 936960.

The previous prime is 2557967. The next prime is 2557999. The reversal of 2557990 is 997552.

It is an Ulam number.

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 15 ways as a sum of consecutive naturals, for example, 6787 + ... + 7153.

It is an arithmetic number, because the mean of its divisors is an integer number (156492).

2^2557990 is an apocalyptic number.

2557990 is a deficient number, since it is larger than the sum of its proper divisors (2449754).

2557990 is a wasteful number, since it uses less digits than its factorization.

2557990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 432.

The product of its (nonzero) digits is 28350, while the sum is 37.

The square root of 2557990 is about 1599.3717516575. The cubic root of 2557990 is about 136.7622637384.

The spelling of 2557990 in words is "two million, five hundred fifty-seven thousand, nine hundred ninety".