1209879 has 24 divisors (see below), whose sum is σ = 1941264. Its totient is φ = 726000.

The previous prime is 1209877. The next prime is 1209883. The reversal of 1209879 is 9789021.

It is a happy number.

It is not a de Polignac number, because 1209879 - 2¹ = 1209877 is a prime.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1209877) 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 23 ways as a sum of consecutive naturals, for example, 11929 + ... + 12029.

It is an arithmetic number, because the mean of its divisors is an integer number (80886).

2^1209879 is an apocalyptic number.

1209879 is a deficient number, since it is larger than the sum of its proper divisors (731385).

1209879 is a wasteful number, since it uses less digits than its factorization.

1209879 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140 (or 115 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 36.

The square root of 1209879 is about 1099.9449986249. The cubic root of 1209879 is about 106.5566715508.

It can be divided in two parts, 120 and 9879, that added together give a palindrome (9999).

The spelling of 1209879 in words is "one million, two hundred nine thousand, eight hundred seventy-nine".