181423872 has 162 divisors, whose sum is σ = 608870808. Its totient is φ = 51803136.

The previous prime is 181423871. The next prime is 181423909. The reversal of 181423872 is 278324181.

181423872 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (181423871) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 112093 + ... + 113699.

Almost surely, 2^181423872 is an apocalyptic number.

181423872 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 181423872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (304435404).

181423872 is an abundant number, since it is smaller than the sum of its proper divisors (427446936).

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

181423872 is a wasteful number, since it uses less digits than its factorization.

181423872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1643 (or 1619 counting only the distinct ones).

The product of its digits is 21504, while the sum is 36.

The square root of 181423872 is about 13469.3679139000. The cubic root of 181423872 is about 566.1065031179.

The spelling of 181423872 in words is "one hundred eighty-one million, four hundred twenty-three thousand, eight hundred seventy-two".