1816001100 has 72 divisors (see below), whose sum is σ = 5838115920. Its totient is φ = 484266240.

The previous prime is 1816001059. The next prime is 1816001101. The reversal of 1816001100 is 11006181.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (1816001101) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 333597 + ... + 338996.

Almost surely, 2^1816001100 is an apocalyptic number.

1816001100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1816001100 is an abundant number, since it is smaller than the sum of its proper divisors (4022114820).

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

1816001100 is a wasteful number, since it uses less digits than its factorization.

1816001100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 672616 (or 672603 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 18.

The square root of 1816001100 is about 42614.5644117126. The cubic root of 1816001100 is about 1220.0342864144.

Adding to 1816001100 its reverse (11006181), we get a palindrome (1827007281).

The spelling of 1816001100 in words is "one billion, eight hundred sixteen million, one thousand, one hundred".