426438640 has 20 divisors (see below), whose sum is σ = 991470024. Its totient is φ = 170575424.

The previous prime is 426438631. The next prime is 426438671. The reversal of 426438640 is 46834624.

It is a tau number, because it is divible by the number of its divisors (20).

It is a self number, because there is not a number n which added to its sum of digits gives 426438640.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2665162 + ... + 2665321.

Almost surely, 2^426438640 is an apocalyptic number.

426438640 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

426438640 is an abundant number, since it is smaller than the sum of its proper divisors (565031384).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

426438640 is a wasteful number, since it uses less digits than its factorization.

426438640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5330496 (or 5330490 counting only the distinct ones).

The product of its (nonzero) digits is 110592, while the sum is 37.

The square root of 426438640 is about 20650.3907953336. The cubic root of 426438640 is about 752.6946858879.

The spelling of 426438640 in words is "four hundred twenty-six million, four hundred thirty-eight thousand, six hundred forty".