189674921 has 2 divisors, whose sum is σ = 189674922. Its totient is φ = 189674920.

The previous prime is 189674917. The next prime is 189674959. The reversal of 189674921 is 129476981.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 138980521 + 50694400 = 11789^2 + 7120^2 .

It is a cyclic number.

It is not a de Polignac number, because 189674921 - 2² = 189674917 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is an alternating number because its digits alternate between odd and even.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (189674021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94837460 + 94837461.

It is an arithmetic number, because the mean of its divisors is an integer number (94837461).

Almost surely, 2^189674921 is an apocalyptic number.

It is an amenable number.

189674921 is a deficient number, since it is larger than the sum of its proper divisors (1).

189674921 is an equidigital number, since it uses as much as digits as its factorization.

189674921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 217728, while the sum is 47.

The square root of 189674921 is about 13772.2518492801. The cubic root of 189674921 is about 574.5616530600.

The spelling of 189674921 in words is "one hundred eighty-nine million, six hundred seventy-four thousand, nine hundred twenty-one".