1280247 has 8 divisors (see below), whose sum is σ = 1712256. Its totient is φ = 850872.

The previous prime is 1280231. The next prime is 1280267. The reversal of 1280247 is 7420821.

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

It is not a de Polignac number, because 1280247 - 2⁴ = 1280231 is a prime.

1280247 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1280267) 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, 1398 + ... + 2124.

It is an arithmetic number, because the mean of its divisors is an integer number (214032).

2^1280247 is an apocalyptic number.

1280247 is a deficient number, since it is larger than the sum of its proper divisors (432009).

1280247 is an equidigital number, since it uses as much as digits as its factorization.

1280247 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1317.

The product of its (nonzero) digits is 896, while the sum is 24.

The square root of 1280247 is about 1131.4800042422. The cubic root of 1280247 is about 108.5836881849.

The spelling of 1280247 in words is "one million, two hundred eighty thousand, two hundred forty-seven".