428239 has 8 divisors (see below), whose sum is σ = 494208. Its totient is φ = 363480.

The previous prime is 428231. The next prime is 428249. The reversal of 428239 is 932824.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 428239 - 2³ = 428231 is a prime.

It is a super-2 number, since 2×428239² = 366777282242, which contains 22 as substring.

It is a Duffinian number.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (428231) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 684 + ... + 1150.

It is an arithmetic number, because the mean of its divisors is an integer number (61776).

2⁴²⁸²³⁹ is an apocalyptic number.

428239 is a deficient number, since it is larger than the sum of its proper divisors (65969).

428239 is a wasteful number, since it uses less digits than its factorization.

428239 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 605.

The product of its digits is 3456, while the sum is 28.

The square root of 428239 is about 654.3997249388. The cubic root of 428239 is about 75.3752453406.

It can be divided in two parts, 42 and 8239, that added together give a square (8281 = 91²).

The spelling of 428239 in words is "four hundred twenty-eight thousand, two hundred thirty-nine".