189391816 has 8 divisors (see below), whose sum is σ = 355109670. Its totient is φ = 94695904.

The previous prime is 189391801. The next prime is 189391841. The reversal of 189391816 is 618193981.

It is a happy number.

189391816 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 160123716 + 29268100 = 12654^2 + 5410^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a hoax number, since the sum of its digits (46) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11836981 + ... + 11836996.

Almost surely, 2^189391816 is an apocalyptic number.

It is an amenable number.

189391816 is a deficient number, since it is larger than the sum of its proper divisors (165717854).

189391816 is a wasteful number, since it uses less digits than its factorization.

189391816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23673983 (or 23673979 counting only the distinct ones).

The product of its digits is 93312, while the sum is 46.

The square root of 189391816 is about 13761.9699171303. The cubic root of 189391816 is about 574.2756509686.

The spelling of 189391816 in words is "one hundred eighty-nine million, three hundred ninety-one thousand, eight hundred sixteen".