181798889 has 8 divisors (see below), whose sum is σ = 184551048. Its totient is φ = 179065600.

The previous prime is 181798873. The next prime is 181798907. The reversal of 181798889 is 988897181.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 69438889 + 112360000 = 8333^2 + 10600^2 .

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 181798889 - 2⁴ = 181798873 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (181798819) 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, 15329 + ... + 24465.

It is an arithmetic number, because the mean of its divisors is an integer number (23068881).

Almost surely, 2^181798889 is an apocalyptic number.

It is an amenable number.

181798889 is a deficient number, since it is larger than the sum of its proper divisors (2752159).

181798889 is a wasteful number, since it uses less digits than its factorization.

181798889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9435.

The product of its digits is 2322432, while the sum is 59.

The square root of 181798889 is about 13483.2818334410. The cubic root of 181798889 is about 566.4962964567.

The spelling of 181798889 in words is "one hundred eighty-one million, seven hundred ninety-eight thousand, eight hundred eighty-nine".