189420091 has 8 divisors (see below), whose sum is σ = 218467040. Its totient is φ = 160869888.

The previous prime is 189420047. The next prime is 189420097. The reversal of 189420091 is 190024981.

189420091 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 189420091 - 2⁷ = 189419963 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (189420097) 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, 123366 + ... + 124891.

It is an arithmetic number, because the mean of its divisors is an integer number (27308380).

Almost surely, 2^189420091 is an apocalyptic number.

189420091 is a deficient number, since it is larger than the sum of its proper divisors (29046949).

189420091 is a wasteful number, since it uses less digits than its factorization.

189420091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 248373.

The product of its (nonzero) digits is 5184, while the sum is 34.

The square root of 189420091 is about 13762.9971663152. The cubic root of 189420091 is about 574.3042281204.

The spelling of 189420091 in words is "one hundred eighty-nine million, four hundred twenty thousand, ninety-one".