189797881 has 8 divisors (see below), whose sum is σ = 233597504. Its totient is φ = 150169680.

The previous prime is 189797873. The next prime is 189797939. The reversal of 189797881 is 188797981.

189797881 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 189797881 - 2³ = 189797873 is a prime.

It is a super-2 number, since 2×189797881² = 72046471264180322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (189797581) 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, 1042755 + ... + 1042936.

It is an arithmetic number, because the mean of its divisors is an integer number (29199688).

Almost surely, 2^189797881 is an apocalyptic number.

It is an amenable number.

189797881 is a deficient number, since it is larger than the sum of its proper divisors (43799623).

189797881 is a wasteful number, since it uses less digits than its factorization.

189797881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2085711.

The product of its digits is 2032128, while the sum is 58.

The square root of 189797881 is about 13776.7151745255. The cubic root of 189797881 is about 574.6857827019.

The spelling of 189797881 in words is "one hundred eighty-nine million, seven hundred ninety-seven thousand, eight hundred eighty-one".