189690818 has 4 divisors (see below), whose sum is σ = 284536230. Its totient is φ = 94845408.

The previous prime is 189690817. The next prime is 189690863. The reversal of 189690818 is 818096981.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 818096981 = 13 ⋅62930537.

It can be written as a sum of positive squares in only one way, i.e., 180284329 + 9406489 = 13427^2 + 3067^2 .

It is not an unprimeable number, because it can be changed into a prime (189690817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 47422703 + ... + 47422706.

Almost surely, 2^189690818 is an apocalyptic number.

189690818 is a deficient number, since it is larger than the sum of its proper divisors (94845412).

189690818 is an equidigital number, since it uses as much as digits as its factorization.

189690818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94845411.

The product of its (nonzero) digits is 248832, while the sum is 50.

The square root of 189690818 is about 13772.8289759221. The cubic root of 189690818 is about 574.5777042972.

The spelling of 189690818 in words is "one hundred eighty-nine million, six hundred ninety thousand, eight hundred eighteen".