1172809979 has 24 divisors (see below), whose sum is σ = 1384488000. Its totient is φ = 982536480.

The previous prime is 1172809943. The next prime is 1172810033. The reversal of 1172809979 is 9799082711.

It is not a de Polignac number, because 1172809979 - 2⁸ = 1172809723 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1172809979.

It is not an unprimeable number, because it can be changed into a prime (1172809279) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 284072 + ... + 288170.

It is an arithmetic number, because the mean of its divisors is an integer number (57687000).

Almost surely, 2^1172809979 is an apocalyptic number.

1172809979 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

1172809979 is a deficient number, since it is larger than the sum of its proper divisors (211678021).

1172809979 is a wasteful number, since it uses less digits than its factorization.

1172809979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4203 (or 4166 counting only the distinct ones).

The product of its (nonzero) digits is 571536, while the sum is 53.

The square root of 1172809979 is about 34246.3133636308. The cubic root of 1172809979 is about 1054.5711452973.

The spelling of 1172809979 in words is "one billion, one hundred seventy-two million, eight hundred nine thousand, nine hundred seventy-nine".