181486812 has 48 divisors (see below), whose sum is σ = 456891680. Its totient is φ = 55738368.

The previous prime is 181486807. The next prime is 181486867. The reversal of 181486812 is 218684181.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 156828 + ... + 157980.

Almost surely, 2^181486812 is an apocalyptic number.

181486812 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

181486812 is an abundant number, since it is smaller than the sum of its proper divisors (275404868).

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

181486812 is a wasteful number, since it uses less digits than its factorization.

181486812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2182 (or 2180 counting only the distinct ones).

The product of its digits is 24576, while the sum is 39.

The square root of 181486812 is about 13471.7041238293. The cubic root of 181486812 is about 566.1719605526.

The spelling of 181486812 in words is "one hundred eighty-one million, four hundred eighty-six thousand, eight hundred twelve".