426797721 has 32 divisors (see below), whose sum is σ = 724039680. Its totient is φ = 243405648.

The previous prime is 426797719. The next prime is 426797731. The reversal of 426797721 is 127797624.

It is not a de Polignac number, because 426797721 - 2¹ = 426797719 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (426797731) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 109020 + ... + 112866.

It is an arithmetic number, because the mean of its divisors is an integer number (22626240).

Almost surely, 2^426797721 is an apocalyptic number.

It is an amenable number.

426797721 is a deficient number, since it is larger than the sum of its proper divisors (297241959).

426797721 is a wasteful number, since it uses less digits than its factorization.

426797721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4450 (or 4444 counting only the distinct ones).

The product of its digits is 296352, while the sum is 45.

The square root of 426797721 is about 20659.0832565242. The cubic root of 426797721 is about 752.9058944952.

The spelling of 426797721 in words is "four hundred twenty-six million, seven hundred ninety-seven thousand, seven hundred twenty-one".