190660865 has 16 divisors (see below), whose sum is σ = 248164560. Its totient is φ = 140052480.

The previous prime is 190660861. The next prime is 190660901. The reversal of 190660865 is 568066091.

It is a Cunningham number, because it is equal to 13808²+1.

It can be written as a sum of positive squares in 8 ways, for example, as 13424896 + 177235969 = 3664^2 + 13313^2 .

It is not a de Polignac number, because 190660865 - 2² = 190660861 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (41).

It is not an unprimeable number, because it can be changed into a prime (190660861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23870 + ... + 30839.

It is an arithmetic number, because the mean of its divisors is an integer number (15510285).

Almost surely, 2^190660865 is an apocalyptic number.

It is an amenable number.

190660865 is a deficient number, since it is larger than the sum of its proper divisors (57503695).

190660865 is a wasteful number, since it uses less digits than its factorization.

190660865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54772.

The product of its (nonzero) digits is 77760, while the sum is 41.

The square root of 190660865 is about 13808.0000362109. Note that the first 4 decimals coincide. The cubic root of 190660865 is about 575.5554707838. Note that the first 3 decimals are identical.

It can be divided in two parts, 19066086 and 5, that added together give a palindrome (19066091).

The spelling of 190660865 in words is "one hundred ninety million, six hundred sixty thousand, eight hundred sixty-five".