1281963 has 8 divisors (see below), whose sum is σ = 1715776. Its totient is φ = 851400.

The previous prime is 1281961. The next prime is 1281971. The reversal of 1281963 is 3691821.

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

It is not a de Polignac number, because 1281963 - 2¹ = 1281961 is a prime.

It is an Ulam number.

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 1281963.

It is not an unprimeable number, because it can be changed into a prime (1281961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 348 + ... + 1638.

It is an arithmetic number, because the mean of its divisors is an integer number (214472).

2^1281963 is an apocalyptic number.

1281963 is a deficient number, since it is larger than the sum of its proper divisors (433813).

1281963 is a wasteful number, since it uses less digits than its factorization.

1281963 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1625.

The product of its digits is 2592, while the sum is 30.

The square root of 1281963 is about 1132.2380491752. The cubic root of 1281963 is about 108.6321804995.

The spelling of 1281963 in words is "one million, two hundred eighty-one thousand, nine hundred sixty-three".