426646623 has 8 divisors (see below), whose sum is σ = 612620848. Its totient is φ = 262551744.

The previous prime is 426646621. The next prime is 426646663. The reversal of 426646623 is 326646624.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 426646623 - 2¹ = 426646621 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39), and also a Moran number because the ratio is a prime number: 10939657 = 426646623 / (4 + 2 + 6 + 6 + 4 + 6 + 6 + 2 + 3).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (426646621) 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 7 ways as a sum of consecutive naturals, for example, 5469790 + ... + 5469867.

It is an arithmetic number, because the mean of its divisors is an integer number (76577606).

Almost surely, 2^426646623 is an apocalyptic number.

426646623 is a deficient number, since it is larger than the sum of its proper divisors (185974225).

426646623 is a wasteful number, since it uses less digits than its factorization.

426646623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10939673.

The product of its digits is 248832, while the sum is 39.

The square root of 426646623 is about 20655.4259941547. The cubic root of 426646623 is about 752.8170342874.

Subtracting from 426646623 its reverse (326646624), we obtain a palindrome (99999999).

The spelling of 426646623 in words is "four hundred twenty-six million, six hundred forty-six thousand, six hundred twenty-three".