426243721 has 2 divisors, whose sum is σ = 426243722. Its totient is φ = 426243720.

The previous prime is 426243689. The next prime is 426243757. The reversal of 426243721 is 127342624.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 347300496 + 78943225 = 18636^2 + 8885^2 .

It is a cyclic number.

It is not a de Polignac number, because 426243721 - 2⁵ = 426243689 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (426241721) 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 as a sum of consecutive naturals, namely, 213121860 + 213121861.

It is an arithmetic number, because the mean of its divisors is an integer number (213121861).

Almost surely, 2^426243721 is an apocalyptic number.

It is an amenable number.

426243721 is a deficient number, since it is larger than the sum of its proper divisors (1).

426243721 is an equidigital number, since it uses as much as digits as its factorization.

426243721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 16128, while the sum is 31.

The square root of 426243721 is about 20645.6707568439. The cubic root of 426243721 is about 752.5799864204.

The spelling of 426243721 in words is "four hundred twenty-six million, two hundred forty-three thousand, seven hundred twenty-one".