799389721 has 8 divisors (see below), whose sum is σ = 864085320. Its totient is φ = 735151872.

The previous prime is 799389709. The next prime is 799389733. The reversal of 799389721 is 127983997.

It is an interprime number because it is at equal distance from previous prime (799389709) and next prime (799389733).

It can be written as a sum of positive squares in 4 ways, for example, as 705600 + 798684121 = 840^2 + 28261^2 .

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

It is not a de Polignac number, because 799389721 - 2⁷ = 799389593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (799389791) 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, 110800 + ... + 117793.

It is an arithmetic number, because the mean of its divisors is an integer number (108010665).

Almost surely, 2^799389721 is an apocalyptic number.

It is an amenable number.

799389721 is a deficient number, since it is larger than the sum of its proper divisors (64695599).

799389721 is a wasteful number, since it uses less digits than its factorization.

799389721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 228875.

The product of its digits is 1714608, while the sum is 55.

The square root of 799389721 is about 28273.4808787316. The cubic root of 799389721 is about 928.0816513229.

The spelling of 799389721 in words is "seven hundred ninety-nine million, three hundred eighty-nine thousand, seven hundred twenty-one".