1142779 has 4 divisors (see below), whose sum is σ = 1246680. Its totient is φ = 1038880.

The previous prime is 1142777. The next prime is 1142783. The reversal of 1142779 is 9772411.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1142779 - 2¹ = 1142777 is a prime.

It is a super-3 number, since 3×1142779³ = 4477215596333985417, which contains 333 as substring.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

1142779 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 1142779.

It is not an unprimeable number, because it can be changed into a prime (1142773) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 51934 + ... + 51955.

It is an arithmetic number, because the mean of its divisors is an integer number (311670).

2^1142779 is an apocalyptic number.

1142779 is a deficient number, since it is larger than the sum of its proper divisors (103901).

1142779 is a wasteful number, since it uses less digits than its factorization.

1142779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103900.

The product of its digits is 3528, while the sum is 31.

The square root of 1142779 is about 1069.0084190501. The cubic root of 1142779 is about 104.5492087556.

The spelling of 1142779 in words is "one million, one hundred forty-two thousand, seven hundred seventy-nine".