1813999442 has 4 divisors (see below), whose sum is σ = 2720999166. Its totient is φ = 906999720.

The previous prime is 1813999417. The next prime is 1813999459. The reversal of 1813999442 is 2449993181.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 1523262841 + 290736601 = 39029^2 + 17051^2 .

It is a super-2 number, since 2×1813999442² = 6581187951152622728, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 453499859 + ... + 453499862.

Almost surely, 2^1813999442 is an apocalyptic number.

1813999442 is a deficient number, since it is larger than the sum of its proper divisors (906999724).

1813999442 is an equidigital number, since it uses as much as digits as its factorization.

1813999442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 906999723.

The product of its digits is 559872, while the sum is 50.

The square root of 1813999442 is about 42591.0723274256. The cubic root of 1813999442 is about 1219.5858672309.

The spelling of 1813999442 in words is "one billion, eight hundred thirteen million, nine hundred ninety-nine thousand, four hundred forty-two".