1821499994738 has 8 divisors (see below), whose sum is σ = 2892970579932. Its totient is φ = 857176468096.

The previous prime is 1821499994729. The next prime is 1821499994837. The reversal of 1821499994738 is 8374999941281.

It can be written as a sum of positive squares in 2 ways, for example, as 1816152436609 + 5347558129 = 1347647^2 + 73127^2 .

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26786764595 + ... + 26786764662.

Almost surely, 2^{1821499994738} is an apocalyptic number.

1821499994738 is a deficient number, since it is larger than the sum of its proper divisors (1071470585194).

1821499994738 is a wasteful number, since it uses less digits than its factorization.

1821499994738 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53573529276.

The product of its digits is 282175488, while the sum is 74.

The spelling of 1821499994738 in words is "one trillion, eight hundred twenty-one billion, four hundred ninety-nine million, nine hundred ninety-four thousand, seven hundred thirty-eight".