426403640 has 64 divisors (see below), whose sum is σ = 1042826400. Its totient is φ = 155976192.

The previous prime is 426403633. The next prime is 426403657. The reversal of 426403640 is 46304624.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 52919 + ... + 60441.

Almost surely, 2^426403640 is an apocalyptic number.

426403640 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 426403640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (521413200).

426403640 is an abundant number, since it is smaller than the sum of its proper divisors (616422760).

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

426403640 is a wasteful number, since it uses less digits than its factorization.

426403640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7656 (or 7652 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 29.

The square root of 426403640 is about 20649.5433363549. The cubic root of 426403640 is about 752.6740928238.

The spelling of 426403640 in words is "four hundred twenty-six million, four hundred three thousand, six hundred forty".