1279887 has 16 divisors (see below), whose sum is σ = 1985280. Its totient is φ = 718272.

The previous prime is 1279877. The next prime is 1279907. The reversal of 1279887 is 7889721.

It is not a de Polignac number, because 1279887 - 2⁴ = 1279871 is a prime.

It is a super-2 number, since 2×1279887² = 3276221465538, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1279807) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 723 + ... + 1755.

It is an arithmetic number, because the mean of its divisors is an integer number (124080).

2^1279887 is an apocalyptic number.

1279887 is a deficient number, since it is larger than the sum of its proper divisors (705393).

1279887 is a wasteful number, since it uses less digits than its factorization.

1279887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1102.

The product of its digits is 56448, while the sum is 42.

The square root of 1279887 is about 1131.3209093798. The cubic root of 1279887 is about 108.5735094740.

The spelling of 1279887 in words is "one million, two hundred seventy-nine thousand, eight hundred eighty-seven".