181839490 has 48 divisors (see below), whose sum is σ = 393064704. Its totient is φ = 60328800.

The previous prime is 181839461. The next prime is 181839499. The reversal of 181839490 is 94938181.

It is not an unprimeable number, because it can be changed into a prime (181839499) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 9205 + ... + 21175.

It is an arithmetic number, because the mean of its divisors is an integer number (8188848).

Almost surely, 2^181839490 is an apocalyptic number.

181839490 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

181839490 is an abundant number, since it is smaller than the sum of its proper divisors (211225214).

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

181839490 is a wasteful number, since it uses less digits than its factorization.

181839490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12023 (or 12016 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 43.

The square root of 181839490 is about 13484.7873546452. The cubic root of 181839490 is about 566.5384650388.

It can be divided in two parts, 181839 and 490, that added together give a square (182329 = 427²).

The spelling of 181839490 in words is "one hundred eighty-one million, eight hundred thirty-nine thousand, four hundred ninety".