189574987 has 4 divisors (see below), whose sum is σ = 216657136. Its totient is φ = 162492840.

The previous prime is 189574967. The next prime is 189574991. The reversal of 189574987 is 789475981.

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 189574987 - 2⁷ = 189574859 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (189574937) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13541064 + ... + 13541077.

It is an arithmetic number, because the mean of its divisors is an integer number (54164284).

Almost surely, 2^189574987 is an apocalyptic number.

189574987 is a deficient number, since it is larger than the sum of its proper divisors (27082149).

189574987 is an equidigital number, since it uses as much as digits as its factorization.

189574987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27082148.

The product of its digits is 5080320, while the sum is 58.

The square root of 189574987 is about 13768.6232790356. The cubic root of 189574987 is about 574.4607289264.

The spelling of 189574987 in words is "one hundred eighty-nine million, five hundred seventy-four thousand, nine hundred eighty-seven".