1028646239 has 4 divisors (see below), whose sum is σ = 1029666720. Its totient is φ = 1027625760.

The previous prime is 1028646209. The next prime is 1028646347. The reversal of 1028646239 is 9326468201.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9326468201 = 227 ⋅41085763.

It is a cyclic number.

It is not a de Polignac number, because 1028646239 - 2²⁸ = 760210783 is a prime.

It is a super-2 number, since 2×1028646239² = 2116226170017690242, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1028646196 and 1028646205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1028646209) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 508727 + ... + 510744.

It is an arithmetic number, because the mean of its divisors is an integer number (257416680).

Almost surely, 2^1028646239 is an apocalyptic number.

1028646239 is a deficient number, since it is larger than the sum of its proper divisors (1020481).

1028646239 is a wasteful number, since it uses less digits than its factorization.

1028646239 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1020480.

The product of its (nonzero) digits is 124416, while the sum is 41.

The square root of 1028646239 is about 32072.5153207540. The cubic root of 1028646239 is about 1009.4589917027.

The spelling of 1028646239 in words is "one billion, twenty-eight million, six hundred forty-six thousand, two hundred thirty-nine".