189836987 has 8 divisors (see below), whose sum is σ = 196554000. Its totient is φ = 183131424.

The previous prime is 189836903. The next prime is 189836993. The reversal of 189836987 is 789638981.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 189836987 - 2¹² = 189832891 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (189836587) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 44264 + ... + 48362.

It is an arithmetic number, because the mean of its divisors is an integer number (24569250).

Almost surely, 2^189836987 is an apocalyptic number.

189836987 is a deficient number, since it is larger than the sum of its proper divisors (6717013).

189836987 is a wasteful number, since it uses less digits than its factorization.

189836987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5725.

The product of its digits is 5225472, while the sum is 59.

The square root of 189836987 is about 13778.1343802418. The cubic root of 189836987 is about 574.7252494560.

The spelling of 189836987 in words is "one hundred eighty-nine million, eight hundred thirty-six thousand, nine hundred eighty-seven".