426220409 has 2 divisors, whose sum is σ = 426220410. Its totient is φ = 426220408.

The previous prime is 426220397. The next prime is 426220423. The reversal of 426220409 is 904022624.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 301786384 + 124434025 = 17372^2 + 11155^2 .

It is a cyclic number.

It is not a de Polignac number, because 426220409 - 2²⁰ = 425171833 is a prime.

It is not a weakly prime, because it can be changed into another prime (426220469) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 213110204 + 213110205.

It is an arithmetic number, because the mean of its divisors is an integer number (213110205).

Almost surely, 2^426220409 is an apocalyptic number.

It is an amenable number.

426220409 is a deficient number, since it is larger than the sum of its proper divisors (1).

426220409 is an equidigital number, since it uses as much as digits as its factorization.

426220409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6912, while the sum is 29.

The square root of 426220409 is about 20645.1061755565. The cubic root of 426220409 is about 752.5662662070.

The spelling of 426220409 in words is "four hundred twenty-six million, two hundred twenty thousand, four hundred nine".