1173628979 has 4 divisors (see below), whose sum is σ = 1195772976. Its totient is φ = 1151484984.

The previous prime is 1173628931. The next prime is 1173628987. The reversal of 1173628979 is 9798263711.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9798263711 = 157 ⋅62409323.

It is a cyclic number.

It is not a de Polignac number, because 1173628979 - 2¹² = 1173624883 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (53), and also a Moran number because the ratio is a prime number: 22143943 = 1173628979 / (1 + 1 + 7 + 3 + 6 + 2 + 8 + 9 + 7 + 9).

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 1173628979.

It is not an unprimeable number, because it can be changed into a prime (1173628909) 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, 11071919 + ... + 11072024.

It is an arithmetic number, because the mean of its divisors is an integer number (298943244).

Almost surely, 2^1173628979 is an apocalyptic number.

1173628979 is a deficient number, since it is larger than the sum of its proper divisors (22143997).

1173628979 is an equidigital number, since it uses as much as digits as its factorization.

1173628979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22143996.

The product of its digits is 1143072, while the sum is 53.

The square root of 1173628979 is about 34258.2687682842. The cubic root of 1173628979 is about 1054.8165652192.

The spelling of 1173628979 in words is "one billion, one hundred seventy-three million, six hundred twenty-eight thousand, nine hundred seventy-nine".