189678717 has 6 divisors (see below), whose sum is σ = 273980382. Its totient is φ = 126452472.

The previous prime is 189678667. The next prime is 189678721. The reversal of 189678717 is 717876981.

It can be written as a sum of positive squares in only one way, i.e., 174398436 + 15280281 = 13206^2 + 3909^2 .

It is not a de Polignac number, because 189678717 - 2¹² = 189674621 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (189678617) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 10537698 + ... + 10537715.

It is an arithmetic number, because the mean of its divisors is an integer number (45663397).

Almost surely, 2^189678717 is an apocalyptic number.

It is an amenable number.

189678717 is a deficient number, since it is larger than the sum of its proper divisors (84301665).

189678717 is a wasteful number, since it uses less digits than its factorization.

189678717 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21075419 (or 21075416 counting only the distinct ones).

The product of its digits is 1185408, while the sum is 54.

The square root of 189678717 is about 13772.3896619287. The cubic root of 189678717 is about 574.5654859713.

The spelling of 189678717 in words is "one hundred eighty-nine million, six hundred seventy-eight thousand, seven hundred seventeen".