189874487 has 4 divisors (see below), whose sum is σ = 207135816. Its totient is φ = 172613160.

The previous prime is 189874483. The next prime is 189874537. The reversal of 189874487 is 784478981.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 189874487 - 2² = 189874483 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 (189874483) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8630648 + ... + 8630669.

It is an arithmetic number, because the mean of its divisors is an integer number (51783954).

Almost surely, 2^189874487 is an apocalyptic number.

189874487 is a deficient number, since it is larger than the sum of its proper divisors (17261329).

189874487 is a wasteful number, since it uses less digits than its factorization.

189874487 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17261328.

The product of its digits is 3612672, while the sum is 56.

The square root of 189874487 is about 13779.4951649181. The cubic root of 189874487 is about 574.7630903043.

The spelling of 189874487 in words is "one hundred eighty-nine million, eight hundred seventy-four thousand, four hundred eighty-seven".