189684281 has 4 divisors (see below), whose sum is σ = 189716352. Its totient is φ = 189652212.

The previous prime is 189684263. The next prime is 189684323. The reversal of 189684281 is 182486981.

It is a happy number.

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, and also an emirpimes, since its reverse is a distinct semiprime: 182486981 = 7019 ⋅25999.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-189684281 is a prime.

It is a super-2 number, since 2×189684281² = 71960252916973922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (189684251) 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, 4301 + ... + 19946.

It is an arithmetic number, because the mean of its divisors is an integer number (47429088).

Almost surely, 2^189684281 is an apocalyptic number.

It is an amenable number.

189684281 is a deficient number, since it is larger than the sum of its proper divisors (32071).

189684281 is an equidigital number, since it uses as much as digits as its factorization.

189684281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32070.

The product of its digits is 221184, while the sum is 47.

The square root of 189684281 is about 13772.5916587983. The cubic root of 189684281 is about 574.5711039819.

The spelling of 189684281 in words is "one hundred eighty-nine million, six hundred eighty-four thousand, two hundred eighty-one".