181872489 has 8 divisors (see below), whose sum is σ = 243277632. Its totient is φ = 120857840.

The previous prime is 181872463. The next prime is 181872517. The reversal of 181872489 is 984278181.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 181872489 - 2⁸ = 181872233 is a prime.

It is not an unprimeable number, because it can be changed into a prime (181872289) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 96534 + ... + 98399.

It is an arithmetic number, because the mean of its divisors is an integer number (30409704).

Almost surely, 2^181872489 is an apocalyptic number.

It is an amenable number.

181872489 is a deficient number, since it is larger than the sum of its proper divisors (61405143).

181872489 is a wasteful number, since it uses less digits than its factorization.

181872489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 195247.

The product of its digits is 258048, while the sum is 48.

The square root of 181872489 is about 13486.0108631129. The cubic root of 181872489 is about 566.5727334881.

The spelling of 181872489 in words is "one hundred eighty-one million, eight hundred seventy-two thousand, four hundred eighty-nine".