2057998 has 4 divisors (see below), whose sum is σ = 3087000. Its totient is φ = 1028998.

The previous prime is 2057987. The next prime is 2057999. The reversal of 2057998 is 8997502.

It is a semiprime because it is the product of two primes.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 2057998.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2057999) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 514498 + ... + 514501.

It is an arithmetic number, because the mean of its divisors is an integer number (771750).

2^2057998 is an apocalyptic number.

2057998 is a deficient number, since it is larger than the sum of its proper divisors (1029002).

2057998 is a wasteful number, since it uses less digits than its factorization.

2057998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1029001.

The product of its (nonzero) digits is 45360, while the sum is 40.

The square root of 2057998 is about 1434.5724101627. The cubic root of 2057998 is about 127.1984002937.

The spelling of 2057998 in words is "two million, fifty-seven thousand, nine hundred ninety-eight".