1282391 has 8 divisors (see below), whose sum is σ = 1419024. Its totient is φ = 1149120.

The previous prime is 1282387. The next prime is 1282399. The reversal of 1282391 is 1932821.

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 1282391 - 2² = 1282387 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1282391.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1282399) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5 + ... + 1601.

It is an arithmetic number, because the mean of its divisors is an integer number (177378).

2^1282391 is an apocalyptic number.

1282391 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1282391 is a deficient number, since it is larger than the sum of its proper divisors (136633).

1282391 is a wasteful number, since it uses less digits than its factorization.

1282391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1681.

The product of its digits is 864, while the sum is 26.

The square root of 1282391 is about 1132.4270395924. The cubic root of 1282391 is about 108.6442685759.

The spelling of 1282391 in words is "one million, two hundred eighty-two thousand, three hundred ninety-one".