189218813 has 8 divisors (see below), whose sum is σ = 221524800. Its totient is φ = 158231520.

The previous prime is 189218759. The next prime is 189218879. The reversal of 189218813 is 318812981.

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 189218813 - 2¹⁶ = 189153277 is a prime.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (189218213) 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, 329363 + ... + 329936.

It is an arithmetic number, because the mean of its divisors is an integer number (27690600).

Almost surely, 2^189218813 is an apocalyptic number.

It is an amenable number.

189218813 is a deficient number, since it is larger than the sum of its proper divisors (32305987).

189218813 is an equidigital number, since it uses as much as digits as its factorization.

189218813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 659347.

The product of its digits is 27648, while the sum is 41.

The square root of 189218813 is about 13755.6829347001. The cubic root of 189218813 is about 574.1007372557.

The spelling of 189218813 in words is "one hundred eighty-nine million, two hundred eighteen thousand, eight hundred thirteen".