1818972793 has 6 divisors (see below), whose sum is σ = 1999366922. Its totient is φ = 1653611520.

The previous prime is 1818972791. The next prime is 1818972797. The reversal of 1818972793 is 3972798181.

It can be written as a sum of positive squares in only one way, i.e., 980754489 + 838218304 = 31317^2 + 28952^2 .

It is not a de Polignac number, because 1818972793 - 2¹ = 1818972791 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1818972791) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 7516296 + ... + 7516537.

Almost surely, 2^1818972793 is an apocalyptic number.

It is an amenable number.

1818972793 is a deficient number, since it is larger than the sum of its proper divisors (180394129).

1818972793 is a wasteful number, since it uses less digits than its factorization.

1818972793 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15032855 (or 15032844 counting only the distinct ones).

The product of its digits is 1524096, while the sum is 55.

The square root of 1818972793 is about 42649.4172644832. The cubic root of 1818972793 is about 1220.6994092725.

The spelling of 1818972793 in words is "one billion, eight hundred eighteen million, nine hundred seventy-two thousand, seven hundred ninety-three".