181980839 has 8 divisors (see below), whose sum is σ = 186098640. Its totient is φ = 177897600.

The previous prime is 181980833. The next prime is 181980857. The reversal of 181980839 is 938089181.

It is a happy number.

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 181980839 - 2⁴ = 181980823 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 181980793 and 181980802.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (181980833) 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, 2159 + ... + 19199.

It is an arithmetic number, because the mean of its divisors is an integer number (23262330).

Almost surely, 2^181980839 is an apocalyptic number.

181980839 is a deficient number, since it is larger than the sum of its proper divisors (4117801).

181980839 is a wasteful number, since it uses less digits than its factorization.

181980839 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17281.

The product of its (nonzero) digits is 124416, while the sum is 47.

The square root of 181980839 is about 13490.0273906319. The cubic root of 181980839 is about 566.6852224989.

The spelling of 181980839 in words is "one hundred eighty-one million, nine hundred eighty thousand, eight hundred thirty-nine".