426730391 has 2 divisors, whose sum is σ = 426730392. Its totient is φ = 426730390.

The previous prime is 426730309. The next prime is 426730393. The reversal of 426730391 is 193037624.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-426730391 is a prime.

Together with 426730393, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (426730393) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 213365195 + 213365196.

It is an arithmetic number, because the mean of its divisors is an integer number (213365196).

Almost surely, 2^426730391 is an apocalyptic number.

426730391 is a deficient number, since it is larger than the sum of its proper divisors (1).

426730391 is an equidigital number, since it uses as much as digits as its factorization.

426730391 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27216, while the sum is 35.

The square root of 426730391 is about 20657.4536426928. The cubic root of 426730391 is about 752.8663005476.

The spelling of 426730391 in words is "four hundred twenty-six million, seven hundred thirty thousand, three hundred ninety-one".