426815991 has 48 divisors (see below), whose sum is σ = 778512384. Its totient is φ = 219555072.

The previous prime is 426815969. The next prime is 426816011. The reversal of 426815991 is 199518624.

It is not a de Polignac number, because 426815991 - 2⁹ = 426815479 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (426815911) 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 47 ways as a sum of consecutive naturals, for example, 15970 + ... + 33296.

It is an arithmetic number, because the mean of its divisors is an integer number (16219008).

Almost surely, 2^426815991 is an apocalyptic number.

426815991 is a deficient number, since it is larger than the sum of its proper divisors (351696393).

426815991 is a wasteful number, since it uses less digits than its factorization.

426815991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17380 (or 17377 counting only the distinct ones).

The product of its digits is 155520, while the sum is 45.

The square root of 426815991 is about 20659.5254301738. The cubic root of 426815991 is about 752.9166375972.

The spelling of 426815991 in words is "four hundred twenty-six million, eight hundred fifteen thousand, nine hundred ninety-one".