1273999 has 8 divisors (see below), whose sum is σ = 1330560. Its totient is φ = 1218336.

The previous prime is 1273981. The next prime is 1274011. The reversal of 1273999 is 9993721.

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 1273999 - 2¹⁹ = 749711 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1273919) 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, 5602 + ... + 5824.

It is an arithmetic number, because the mean of its divisors is an integer number (166320).

2^1273999 is an apocalyptic number.

1273999 is a deficient number, since it is larger than the sum of its proper divisors (56561).

1273999 is a wasteful number, since it uses less digits than its factorization.

1273999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 449.

The product of its digits is 30618, while the sum is 40.

The square root of 1273999 is about 1128.7156417805. The cubic root of 1273999 is about 108.4067594265.

The spelling of 1273999 in words is "one million, two hundred seventy-three thousand, nine hundred ninety-nine".