1279903 has 4 divisors (see below), whose sum is σ = 1282168. Its totient is φ = 1277640.

The previous prime is 1279877. The next prime is 1279907. The reversal of 1279903 is 3099721.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 3099721 = 31 ⋅99991.

It is a cyclic number.

It is not a de Polignac number, because 1279903 - 2⁵ = 1279871 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 (1279907) 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 3 ways as a sum of consecutive naturals, for example, 508 + ... + 1678.

It is an arithmetic number, because the mean of its divisors is an integer number (320542).

2^1279903 is an apocalyptic number.

1279903 is a deficient number, since it is larger than the sum of its proper divisors (2265).

1279903 is a wasteful number, since it uses less digits than its factorization.

1279903 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2264.

The product of its (nonzero) digits is 3402, while the sum is 31.

The square root of 1279903 is about 1131.3279807377. The cubic root of 1279903 is about 108.5739619017.

The spelling of 1279903 in words is "one million, two hundred seventy-nine thousand, nine hundred three".