181138368 has 28 divisors (see below), whose sum is σ = 479262440. Its totient is φ = 60379392.

The previous prime is 181138367. The next prime is 181138411. The reversal of 181138368 is 863831181.

It is a super-2 number, since 2×181138368² = 65622216723406848, which contains 22 as substring.

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 (181138361) 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, 471523 + ... + 471906.

Almost surely, 2^181138368 is an apocalyptic number.

It is an amenable number.

181138368 is an abundant number, since it is smaller than the sum of its proper divisors (298124072).

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

181138368 is an equidigital number, since it uses as much as digits as its factorization.

181138368 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 943444 (or 943434 counting only the distinct ones).

The product of its digits is 27648, while the sum is 39.

The square root of 181138368 is about 13458.7654708744. The cubic root of 181138368 is about 565.8093894652.

The spelling of 181138368 in words is "one hundred eighty-one million, one hundred thirty-eight thousand, three hundred sixty-eight".