426428421 has 4 divisors (see below), whose sum is σ = 568571232. Its totient is φ = 284285612.

The previous prime is 426428411. The next prime is 426428437. The reversal of 426428421 is 124824624.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 426428421 - 2⁵ = 426428389 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (426428411) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 71071401 + ... + 71071406.

It is an arithmetic number, because the mean of its divisors is an integer number (142142808).

Almost surely, 2^426428421 is an apocalyptic number.

It is an amenable number.

426428421 is a deficient number, since it is larger than the sum of its proper divisors (142142811).

426428421 is a wasteful number, since it uses less digits than its factorization.

426428421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142142810.

The product of its digits is 24576, while the sum is 33.

The square root of 426428421 is about 20650.1433651198. The cubic root of 426428421 is about 752.6886734181.

The spelling of 426428421 in words is "four hundred twenty-six million, four hundred twenty-eight thousand, four hundred twenty-one".