9814399721 has 8 divisors (see below), whose sum is σ = 11217282624. Its totient is φ = 8411723280.

The previous prime is 9814399717. The next prime is 9814399729. The reversal of 9814399721 is 1279934189.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 9814399721 - 2² = 9814399717 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9814399729) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 69071 + ... + 156203.

It is an arithmetic number, because the mean of its divisors is an integer number (1402160328).

Almost surely, 2^9814399721 is an apocalyptic number.

It is an amenable number.

9814399721 is a deficient number, since it is larger than the sum of its proper divisors (1402882903).

9814399721 is a wasteful number, since it uses less digits than its factorization.

9814399721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103231.

The product of its digits is 979776, while the sum is 53.

The square root of 9814399721 is about 99067.6522433029. The cubic root of 9814399721 is about 2141.0225788821.

The spelling of 9814399721 in words is "nine billion, eight hundred fourteen million, three hundred ninety-nine thousand, seven hundred twenty-one".