189816397 has 8 divisors (see below), whose sum is σ = 196525440. Its totient is φ = 183118320.

The previous prime is 189816391. The next prime is 189816421. The reversal of 189816397 is 793618981.

It is a happy number.

189816397 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-189816397 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (189816391) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 49872 + ... + 53542.

It is an arithmetic number, because the mean of its divisors is an integer number (24565680).

Almost surely, 2^189816397 is an apocalyptic number.

It is an amenable number.

189816397 is a deficient number, since it is larger than the sum of its proper divisors (6709043).

189816397 is a wasteful number, since it uses less digits than its factorization.

189816397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5483.

The product of its digits is 653184, while the sum is 52.

The square root of 189816397 is about 13777.3871615775. The cubic root of 189816397 is about 574.7044701883.

The spelling of 189816397 in words is "one hundred eighty-nine million, eight hundred sixteen thousand, three hundred ninety-seven".