426720421 has 4 divisors (see below), whose sum is σ = 426908812. Its totient is φ = 426532032.

The previous prime is 426720419. The next prime is 426720457. The reversal of 426720421 is 124027624.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 168636196 + 258084225 = 12986^2 + 16065^2 .

It is a cyclic number.

It is not a de Polignac number, because 426720421 - 2¹ = 426720419 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 12.

It is a self number, because there is not a number n which added to its sum of digits gives 426720421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (426723421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 90756 + ... + 95341.

It is an arithmetic number, because the mean of its divisors is an integer number (106727203).

Almost surely, 2^426720421 is an apocalyptic number.

It is an amenable number.

426720421 is a deficient number, since it is larger than the sum of its proper divisors (188391).

426720421 is a wasteful number, since it uses less digits than its factorization.

426720421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 188390.

The product of its (nonzero) digits is 5376, while the sum is 28.

The square root of 426720421 is about 20657.2123240286. The cubic root of 426720421 is about 752.8604372549.

The spelling of 426720421 in words is "four hundred twenty-six million, seven hundred twenty thousand, four hundred twenty-one".