1818284172 has 12 divisors (see below), whose sum is σ = 4242663096. Its totient is φ = 606094720.

The previous prime is 1818284131. The next prime is 1818284177. The reversal of 1818284172 is 2714828181.

It is a tau number, because it is divible by the number of its divisors (12).

It is not an unprimeable number, because it can be changed into a prime (1818284177) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 75761829 + ... + 75761852.

It is an arithmetic number, because the mean of its divisors is an integer number (353555258).

Almost surely, 2^1818284172 is an apocalyptic number.

1818284172 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1818284172 is an abundant number, since it is smaller than the sum of its proper divisors (2424378924).

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

1818284172 is a wasteful number, since it uses less digits than its factorization.

1818284172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 151523688 (or 151523686 counting only the distinct ones).

The product of its digits is 57344, while the sum is 42.

The square root of 1818284172 is about 42641.3434591360. The cubic root of 1818284172 is about 1220.5453469815.

The spelling of 1818284172 in words is "one billion, eight hundred eighteen million, two hundred eighty-four thousand, one hundred seventy-two".