1028239 has 8 divisors (see below), whose sum is σ = 1088640. Its totient is φ = 969600.

The previous prime is 1028231. The next prime is 1028243. The reversal of 1028239 is 9328201.

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 1028239 - 2³ = 1028231 is a prime.

It is a super-2 number, since 2×1028239² = 2114550882242, which contains 22 as substring.

It is an Ulam number.

It is a Duffinian number.

1028239 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1028231) 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, 867 + ... + 1675.

It is an arithmetic number, because the mean of its divisors is an integer number (136080).

2^1028239 is an apocalyptic number.

1028239 is a deficient number, since it is larger than the sum of its proper divisors (60401).

1028239 is an equidigital number, since it uses as much as digits as its factorization.

1028239 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 881.

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 1028239 is about 1014.0212029341. The cubic root of 1028239 is about 100.9325759850.

The spelling of 1028239 in words is "one million, twenty-eight thousand, two hundred thirty-nine".