426491640 has 96 divisors (see below), whose sum is σ = 1395576000. Its totient is φ = 112953600.

The previous prime is 426491633. The next prime is 426491669. The reversal of 426491640 is 46194624.

426491640 is a `hidden beast` number, since 4 + 2 + 6 + 4 + 9 + 1 + 640 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 426491595 and 426491604.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 49665 + ... + 57615.

It is an arithmetic number, because the mean of its divisors is an integer number (14537250).

Almost surely, 2^426491640 is an apocalyptic number.

426491640 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 426491640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (697788000).

426491640 is an abundant number, since it is smaller than the sum of its proper divisors (969084360).

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

426491640 is a wasteful number, since it uses less digits than its factorization.

426491640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8117 (or 8110 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 36.

The square root of 426491640 is about 20651.6740241560. The cubic root of 426491640 is about 752.7258675258.

The spelling of 426491640 in words is "four hundred twenty-six million, four hundred ninety-one thousand, six hundred forty".