1172820843 has 16 divisors (see below), whose sum is σ = 1744444800. Its totient is φ = 778761000.

The previous prime is 1172820833. The next prime is 1172820877. The reversal of 1172820843 is 3480282711.

It is not a de Polignac number, because 1172820843 - 2⁴ = 1172820827 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 1172820798 and 1172820807.

It is not an unprimeable number, because it can be changed into a prime (1172820823) 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 15 ways as a sum of consecutive naturals, for example, 79753 + ... + 93306.

It is an arithmetic number, because the mean of its divisors is an integer number (109027800).

Almost surely, 2^1172820843 is an apocalyptic number.

1172820843 is a deficient number, since it is larger than the sum of its proper divisors (571623957).

1172820843 is a wasteful number, since it uses less digits than its factorization.

1172820843 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 173319 (or 173313 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 36.

The square root of 1172820843 is about 34246.4719788769. The cubic root of 1172820843 is about 1054.5744015297.

The spelling of 1172820843 in words is "one billion, one hundred seventy-two million, eight hundred twenty thousand, eight hundred forty-three".