2399574021 has 64 divisors (see below), whose sum is σ = 3787483392. Its totient is φ = 1337720832.

The previous prime is 2399574017. The next prime is 2399574041. The reversal of 2399574021 is 1204759932.

It is not a de Polignac number, because 2399574021 - 2² = 2399574017 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2399574041) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2080581 + ... + 2081733.

It is an arithmetic number, because the mean of its divisors is an integer number (59179428).

Almost surely, 2^2399574021 is an apocalyptic number.

It is an amenable number.

2399574021 is a deficient number, since it is larger than the sum of its proper divisors (1387909371).

2399574021 is a wasteful number, since it uses less digits than its factorization.

2399574021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1302.

The product of its (nonzero) digits is 136080, while the sum is 42.

The square root of 2399574021 is about 48985.4470327668. The cubic root of 2399574021 is about 1338.7866831500.

The spelling of 2399574021 in words is "two billion, three hundred ninety-nine million, five hundred seventy-four thousand, twenty-one".