426640 has 20 divisors (see below), whose sum is σ = 992124. Its totient is φ = 170624.

The previous prime is 426637. The next prime is 426641. The reversal of 426640 is 46624.

It can be written as a sum of positive squares in 2 ways, for example, as 331776 + 94864 = 576^2 + 308^2 .

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

It is not an unprimeable number, because it can be changed into a prime (426641) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2587 + ... + 2746.

2⁴²⁶⁶⁴⁰ is an apocalyptic number.

426640 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

426640 is an abundant number, since it is smaller than the sum of its proper divisors (565484).

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

426640 is a wasteful number, since it uses less digits than its factorization.

426640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5346 (or 5340 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 22.

The square root of 426640 is about 653.1768520087. The cubic root of 426640 is about 75.2813138844.

The spelling of 426640 in words is "four hundred twenty-six thousand, six hundred forty".