428345 has 4 divisors (see below), whose sum is σ = 514020. Its totient is φ = 342672.

The previous prime is 428339. The next prime is 428353. The reversal of 428345 is 543824.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 182329 + 246016 = 427^2 + 496^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-428345 is a prime.

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, 42830 + ... + 42839.

It is an arithmetic number, because the mean of its divisors is an integer number (128505).

2⁴²⁸³⁴⁵ is an apocalyptic number.

It is an amenable number.

428345 is a deficient number, since it is larger than the sum of its proper divisors (85675).

428345 is an equidigital number, since it uses as much as digits as its factorization.

428345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85674.

The product of its digits is 3840, while the sum is 26.

The square root of 428345 is about 654.4807101817. The cubic root of 428345 is about 75.3814639217.

The spelling of 428345 in words is "four hundred twenty-eight thousand, three hundred forty-five".