428440 has 16 divisors (see below), whose sum is σ = 964080. Its totient is φ = 171360.

The previous prime is 428429. The next prime is 428471. The reversal of 428440 is 44824.

428440 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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, 5316 + ... + 5395.

It is an arithmetic number, because the mean of its divisors is an integer number (60255).

2⁴²⁸⁴⁴⁰ is an apocalyptic number.

428440 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

428440 is an abundant number, since it is smaller than the sum of its proper divisors (535640).

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

428440 is a wasteful number, since it uses less digits than its factorization.

428440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10722 (or 10718 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 22.

The square root of 428440 is about 654.5532827815. The cubic root of 428440 is about 75.3870363067.

It can be divided in two parts, 428 and 440, that added together give a palindrome (868).

The spelling of 428440 in words is "four hundred twenty-eight thousand, four hundred forty".