189220487 has 4 divisors (see below), whose sum is σ = 199179480. Its totient is φ = 179261496.

The previous prime is 189220459. The next prime is 189220501. The reversal of 189220487 is 784022981.

189220487 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 is a cyclic number.

It is not a de Polignac number, because 189220487 - 2¹⁶ = 189154951 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 (189220457) 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, 4979468 + ... + 4979505.

It is an arithmetic number, because the mean of its divisors is an integer number (49794870).

Almost surely, 2^189220487 is an apocalyptic number.

189220487 is a deficient number, since it is larger than the sum of its proper divisors (9958993).

189220487 is an equidigital number, since it uses as much as digits as its factorization.

189220487 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9958992.

The product of its (nonzero) digits is 64512, while the sum is 41.

The square root of 189220487 is about 13755.7437821442. The cubic root of 189220487 is about 574.1024302547.

The spelling of 189220487 in words is "one hundred eighty-nine million, two hundred twenty thousand, four hundred eighty-seven".