189836881 has 4 divisors (see below), whose sum is σ = 204439732. Its totient is φ = 175234032.

The previous prime is 189836863. The next prime is 189836891. The reversal of 189836881 is 188638981.

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

It can be written as a sum of positive squares in 2 ways, for example, as 112678225 + 77158656 = 10615^2 + 8784^2 .

It is a cyclic number.

It is not a de Polignac number, because 189836881 - 2⁹ = 189836369 is a prime.

It is a super-2 number, since 2×189836881² = 72076082775616322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (189836821) 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, 7301406 + ... + 7301431.

It is an arithmetic number, because the mean of its divisors is an integer number (51109933).

Almost surely, 2^189836881 is an apocalyptic number.

It is an amenable number.

189836881 is a deficient number, since it is larger than the sum of its proper divisors (14602851).

189836881 is a wasteful number, since it uses less digits than its factorization.

189836881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14602850.

The product of its digits is 663552, while the sum is 52.

The square root of 189836881 is about 13778.1305335666. The cubic root of 189836881 is about 574.7251424855.

The spelling of 189836881 in words is "one hundred eighty-nine million, eight hundred thirty-six thousand, eight hundred eighty-one".