181243830 has 32 divisors (see below), whose sum is σ = 441116928. Its totient is φ = 47650400.

The previous prime is 181243813. The next prime is 181243877. The reversal of 181243830 is 38342181.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 40416 + ... + 44675.

It is an arithmetic number, because the mean of its divisors is an integer number (13784904).

Almost surely, 2^181243830 is an apocalyptic number.

181243830 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

181243830 is an abundant number, since it is smaller than the sum of its proper divisors (259873098).

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

181243830 is a wasteful number, since it uses less digits than its factorization.

181243830 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85172.

The product of its (nonzero) digits is 4608, while the sum is 30.

The square root of 181243830 is about 13462.6828678388. The cubic root of 181243830 is about 565.9191762793.

The spelling of 181243830 in words is "one hundred eighty-one million, two hundred forty-three thousand, eight hundred thirty".