806996721 has 16 divisors (see below), whose sum is σ = 1114380288. Its totient is φ = 519128400.

The previous prime is 806996711. The next prime is 806996737. The reversal of 806996721 is 127699608.

It is not a de Polignac number, because 806996721 - 2⁵ = 806996689 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (806996711) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30295 + ... + 50316.

It is an arithmetic number, because the mean of its divisors is an integer number (69648768).

Almost surely, 2^806996721 is an apocalyptic number.

It is an amenable number.

806996721 is a deficient number, since it is larger than the sum of its proper divisors (307383567).

806996721 is a wasteful number, since it uses less digits than its factorization.

806996721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80732.

The product of its (nonzero) digits is 326592, while the sum is 48.

The square root of 806996721 is about 28407.6877094916. The cubic root of 806996721 is about 931.0162402567.

The spelling of 806996721 in words is "eight hundred six million, nine hundred ninety-six thousand, seven hundred twenty-one".