426643921 has 8 divisors (see below), whose sum is σ = 465602688. Its totient is φ = 387714000.

The previous prime is 426643913. The next prime is 426643933. The reversal of 426643921 is 129346624.

It is a happy number.

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 426643921 - 2³ = 426643913 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (426644921) 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, 33976 + ... + 44806.

It is an arithmetic number, because the mean of its divisors is an integer number (58200336).

Almost surely, 2^426643921 is an apocalyptic number.

It is an amenable number.

426643921 is a deficient number, since it is larger than the sum of its proper divisors (38958767).

426643921 is a wasteful number, since it uses less digits than its factorization.

426643921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14423.

The product of its digits is 62208, while the sum is 37.

The square root of 426643921 is about 20655.3605875085. The cubic root of 426643921 is about 752.8154450597.

The spelling of 426643921 in words is "four hundred twenty-six million, six hundred forty-three thousand, nine hundred twenty-one".