2578997 has 4 divisors (see below), whose sum is σ = 2598816. Its totient is φ = 2559180.

The previous prime is 2578993. The next prime is 2579009. The reversal of 2578997 is 7998752.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2578997 - 2² = 2578993 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2578991) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9713 + ... + 9974.

It is an arithmetic number, because the mean of its divisors is an integer number (649704).

2^2578997 is an apocalyptic number.

It is an amenable number.

2578997 is a deficient number, since it is larger than the sum of its proper divisors (19819).

2578997 is a wasteful number, since it uses less digits than its factorization.

2578997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19818.

The product of its digits is 317520, while the sum is 47.

The square root of 2578997 is about 1605.9255898079. The cubic root of 2578997 is about 137.1356214664.

The spelling of 2578997 in words is "two million, five hundred seventy-eight thousand, nine hundred ninety-seven".