2398986721 has 4 divisors (see below), whose sum is σ = 2525249200. Its totient is φ = 2272724244.

The previous prime is 2398986697. The next prime is 2398986731. The reversal of 2398986721 is 1276898932.

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 2398986721 - 2⁹ = 2398986209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2398986731) 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, 63131211 + ... + 63131248.

It is an arithmetic number, because the mean of its divisors is an integer number (631312300).

Almost surely, 2^2398986721 is an apocalyptic number.

It is an amenable number.

2398986721 is a deficient number, since it is larger than the sum of its proper divisors (126262479).

2398986721 is a wasteful number, since it uses less digits than its factorization.

2398986721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126262478.

The product of its digits is 2612736, while the sum is 55.

The square root of 2398986721 is about 48979.4520283761. The cubic root of 2398986721 is about 1338.6774507657.

The spelling of 2398986721 in words is "two billion, three hundred ninety-eight million, nine hundred eighty-six thousand, seven hundred twenty-one".