1820782979 has 8 divisors (see below), whose sum is σ = 1839810720. Its totient is φ = 1801797696.

The previous prime is 1820782973. The next prime is 1820782991. The reversal of 1820782979 is 9792870281.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1820782979 - 2²⁰ = 1819734403 is a prime.

It is a super-2 number, since 2×1820782979² = 6630501313232228882, which contains 22 as substring.

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 1820782979.

It is not an unprimeable number, because it can be changed into a prime (1820782973) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 79559 + ... + 99855.

It is an arithmetic number, because the mean of its divisors is an integer number (229976340).

Almost surely, 2^1820782979 is an apocalyptic number.

1820782979 is a deficient number, since it is larger than the sum of its proper divisors (19027741).

1820782979 is a wasteful number, since it uses less digits than its factorization.

1820782979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21229.

The product of its (nonzero) digits is 1016064, while the sum is 53.

The square root of 1820782979 is about 42670.6336840690. The cubic root of 1820782979 is about 1221.1042092395.

The spelling of 1820782979 in words is "one billion, eight hundred twenty million, seven hundred eighty-two thousand, nine hundred seventy-nine".