189894965 has 16 divisors (see below), whose sum is σ = 245861616. Its totient is φ = 139968000.

The previous prime is 189894961. The next prime is 189894983. The reversal of 189894965 is 569498981.

It can be written as a sum of positive squares in 8 ways, for example, as 5424241 + 184470724 = 2329^2 + 13582^2 .

It is not a de Polignac number, because 189894965 - 2² = 189894961 is a prime.

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

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (189894961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 36635 + ... + 41495.

It is an arithmetic number, because the mean of its divisors is an integer number (15366351).

Almost surely, 2^189894965 is an apocalyptic number.

It is an amenable number.

189894965 is a deficient number, since it is larger than the sum of its proper divisors (55966651).

189894965 is a wasteful number, since it uses less digits than its factorization.

189894965 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5480.

The product of its digits is 5598720, while the sum is 59.

The square root of 189894965 is about 13780.2382054883. The cubic root of 189894965 is about 574.7837523315.

The spelling of 189894965 in words is "one hundred eighty-nine million, eight hundred ninety-four thousand, nine hundred sixty-five".