426440 has 32 divisors (see below), whose sum is σ = 1097280. Its totient is φ = 146112.

The previous prime is 426427. The next prime is 426469. The reversal of 426440 is 44624.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 482 + ... + 1041.

It is an arithmetic number, because the mean of its divisors is an integer number (34290).

2⁴²⁶⁴⁴⁰ is an apocalyptic number.

426440 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

426440 is an abundant number, since it is smaller than the sum of its proper divisors (670840).

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

426440 is a wasteful number, since it uses less digits than its factorization.

426440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1541 (or 1537 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 20.

The square root of 426440 is about 653.0237361689. The cubic root of 426440 is about 75.2695486053.

It can be divided in two parts, 42 and 6440, that multiplied together give a triangular number (270480 = T₇₃₅).

The spelling of 426440 in words is "four hundred twenty-six thousand, four hundred forty".