189849681 has 24 divisors (see below), whose sum is σ = 315232320. Its totient is φ = 107852256.

The previous prime is 189849679. The next prime is 189849683. The reversal of 189849681 is 186948981.

It is an interprime number because it is at equal distance from previous prime (189849679) and next prime (189849683).

It is not a de Polignac number, because 189849681 - 2¹ = 189849679 is a prime.

It is a super-2 number, since 2×189849681² = 72085802751603522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (189849683) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2190 + ... + 19608.

It is an arithmetic number, because the mean of its divisors is an integer number (13134680).

Almost surely, 2^189849681 is an apocalyptic number.

It is an amenable number.

189849681 is a deficient number, since it is larger than the sum of its proper divisors (125382639).

189849681 is a wasteful number, since it uses less digits than its factorization.

189849681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17605 (or 17602 counting only the distinct ones).

The product of its digits is 995328, while the sum is 54.

The square root of 189849681 is about 13778.5950299731. The cubic root of 189849681 is about 574.7380593933.

The spelling of 189849681 in words is "one hundred eighty-nine million, eight hundred forty-nine thousand, six hundred eighty-one".