1817979042 has 16 divisors (see below), whose sum is σ = 3966499872. Its totient is φ = 550902720.

The previous prime is 1817979029. The next prime is 1817979043. The reversal of 1817979042 is 2409797181.

It is a junction number, because it is equal to n+sod(n) for n = 1817978982 and 1817979000.

It is not an unprimeable number, because it can be changed into a prime (1817979043) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13772503 + ... + 13772634.

It is an arithmetic number, because the mean of its divisors is an integer number (247906242).

Almost surely, 2^1817979042 is an apocalyptic number.

1817979042 is an abundant number, since it is smaller than the sum of its proper divisors (2148520830).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1817979042 is a wasteful number, since it uses less digits than its factorization.

1817979042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27545153.

The product of its (nonzero) digits is 254016, while the sum is 48.

The square root of 1817979042 is about 42637.7654433250. The cubic root of 1817979042 is about 1220.4770690885.

The spelling of 1817979042 in words is "one billion, eight hundred seventeen million, nine hundred seventy-nine thousand, forty-two".