1816899238 has 16 divisors (see below), whose sum is σ = 3397837824. Its totient is φ = 707882760.

The previous prime is 1816899209. The next prime is 1816899239. The reversal of 1816899238 is 8329986181.

It is a super-2 number, since 2×1816899238² = 6602245682089961288, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1816899239) 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 7 ways as a sum of consecutive naturals, for example, 5898870 + ... + 5899177.

It is an arithmetic number, because the mean of its divisors is an integer number (212364864).

Almost surely, 2^1816899238 is an apocalyptic number.

1816899238 is a deficient number, since it is larger than the sum of its proper divisors (1580938586).

1816899238 is a wasteful number, since it uses less digits than its factorization.

1816899238 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11798067.

The product of its digits is 1492992, while the sum is 55.

The square root of 1816899238 is about 42625.1010321383. The cubic root of 1816899238 is about 1220.2353836789.

The spelling of 1816899238 in words is "one billion, eight hundred sixteen million, eight hundred ninety-nine thousand, two hundred thirty-eight".