189807538 has 4 divisors (see below), whose sum is σ = 284711310. Its totient is φ = 94903768.

The previous prime is 189807529. The next prime is 189807551. The reversal of 189807538 is 835708981.

189807538 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 162486009 + 27321529 = 12747^2 + 5227^2 .

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 189807491 and 189807500.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 47451883 + ... + 47451886.

Almost surely, 2^189807538 is an apocalyptic number.

189807538 is a deficient number, since it is larger than the sum of its proper divisors (94903772).

189807538 is an equidigital number, since it uses as much as digits as its factorization.

189807538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94903771.

The product of its (nonzero) digits is 483840, while the sum is 49.

The square root of 189807538 is about 13777.0656527433. The cubic root of 189807538 is about 574.6955292921.

The spelling of 189807538 in words is "one hundred eighty-nine million, eight hundred seven thousand, five hundred thirty-eight".