187689697 has 8 divisors (see below), whose sum is σ = 204399720. Its totient is φ = 171304320.

The previous prime is 187689611. The next prime is 187689731. The reversal of 187689697 is 796986781.

It can be written as a sum of positive squares in 4 ways, for example, as 3381921 + 184307776 = 1839^2 + 13576^2 .

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 187689697 - 2¹⁵ = 187656929 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (187684697) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 79954 + ... + 82267.

It is an arithmetic number, because the mean of its divisors is an integer number (25549965).

Almost surely, 2^187689697 is an apocalyptic number.

It is an amenable number.

187689697 is a deficient number, since it is larger than the sum of its proper divisors (16710023).

187689697 is a wasteful number, since it uses less digits than its factorization.

187689697 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 162323.

The product of its digits is 9144576, while the sum is 61.

The square root of 187689697 is about 13699.9889416014. The cubic root of 187689697 is about 572.5500774257.

The spelling of 187689697 in words is "one hundred eighty-seven million, six hundred eighty-nine thousand, six hundred ninety-seven".