426438638 has 16 divisors (see below), whose sum is σ = 650371680. Its totient is φ = 209664000.

The previous prime is 426438631. The next prime is 426438671. The reversal of 426438638 is 836834624.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (426438631) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 53198 + ... + 60686.

It is an arithmetic number, because the mean of its divisors is an integer number (40648230).

Almost surely, 2^426438638 is an apocalyptic number.

426438638 is a deficient number, since it is larger than the sum of its proper divisors (223933042).

426438638 is a wasteful number, since it uses less digits than its factorization.

426438638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7963.

The product of its digits is 663552, while the sum is 44.

The square root of 426438638 is about 20650.3907469084. The cubic root of 426438638 is about 752.6946847112.

The spelling of 426438638 in words is "four hundred twenty-six million, four hundred thirty-eight thousand, six hundred thirty-eight".