1287923 has 8 divisors (see below), whose sum is σ = 1585248. Its totient is φ = 1018944.

The previous prime is 1287917. The next prime is 1287947. The reversal of 1287923 is 3297821.

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 1287923 - 2²⁰ = 239347 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1287923.

It is not an unprimeable number, because it can be changed into a prime (1287973) 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, 6986 + ... + 7167.

It is an arithmetic number, because the mean of its divisors is an integer number (198156).

2^1287923 is an apocalyptic number.

1287923 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

1287923 is a deficient number, since it is larger than the sum of its proper divisors (297325).

1287923 is a wasteful number, since it uses less digits than its factorization.

1287923 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14173.

The product of its digits is 6048, while the sum is 32.

The square root of 1287923 is about 1134.8669525544. The cubic root of 1287923 is about 108.8002683006.

The spelling of 1287923 in words is "one million, two hundred eighty-seven thousand, nine hundred twenty-three".