383472181 has 4 divisors (see below), whose sum is σ = 393836332. Its totient is φ = 373108032.

The previous prime is 383472149. The next prime is 383472197. The reversal of 383472181 is 181274383.

It is the 7995-th star number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 186322500 + 197149681 = 13650^2 + 14041^2 .

It is a cyclic number.

It is not a de Polignac number, because 383472181 - 2⁵ = 383472149 is a prime.

It is a super-3 number, since 3×383472181³ (a number of 27 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Harshad number since it is a multiple of its sum of digits (37), and also a Moran number because the ratio is a prime number: 10364113 = 383472181 / (3 + 8 + 3 + 4 + 7 + 2 + 1 + 8 + 1).

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 383472181.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (383472101) 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, 5182020 + ... + 5182093.

It is an arithmetic number, because the mean of its divisors is an integer number (98459083).

Almost surely, 2^383472181 is an apocalyptic number.

It is an amenable number.

383472181 is a deficient number, since it is larger than the sum of its proper divisors (10364151).

383472181 is a wasteful number, since it uses less digits than its factorization.

383472181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10364150.

The product of its digits is 32256, while the sum is 37.

The square root of 383472181 is about 19582.4457359136. The cubic root of 383472181 is about 726.5150598579.

The spelling of 383472181 in words is "three hundred eighty-three million, four hundred seventy-two thousand, one hundred eighty-one".