189383981 has 4 divisors (see below), whose sum is σ = 189730752. Its totient is φ = 189037212.

The previous prime is 189383977. The next prime is 189383983.

189383981 is nontrivially palindromic in base 10.

189383981 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 189383981 - 2² = 189383977 is a prime.

It is a super-2 number, since 2×189383981² = 71732584518816722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (189383983) 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, 172565 + ... + 173658.

It is an arithmetic number, because the mean of its divisors is an integer number (47432688).

Almost surely, 2^189383981 is an apocalyptic number.

It is an amenable number.

189383981 is a deficient number, since it is larger than the sum of its proper divisors (346771).

189383981 is an equidigital number, since it uses as much as digits as its factorization.

189383981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 346770.

The product of its digits is 373248, while the sum is 50.

The square root of 189383981 is about 13761.6852529042. The cubic root of 189383981 is about 574.2677317390.

The spelling of 189383981 in words is "one hundred eighty-nine million, three hundred eighty-three thousand, nine hundred eighty-one".