1280239 has 8 divisors (see below), whose sum is σ = 1379840. Its totient is φ = 1183896.

The previous prime is 1280231. The next prime is 1280267. The reversal of 1280239 is 9320821.

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 1280239 - 2³ = 1280231 is a prime.

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 (1280231) 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, 34 + ... + 1600.

It is an arithmetic number, because the mean of its divisors is an integer number (172480).

2^1280239 is an apocalyptic number.

1280239 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

1280239 is a deficient number, since it is larger than the sum of its proper divisors (99601).

1280239 is a wasteful number, since it uses less digits than its factorization.

1280239 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1629.

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

The square root of 1280239 is about 1131.4764690439. The cubic root of 1280239 is about 108.5834620121.

The spelling of 1280239 in words is "one million, two hundred eighty thousand, two hundred thirty-nine".