189420851 has 8 divisors (see below), whose sum is σ = 200899440. Its totient is φ = 177979648.

The previous prime is 189420841. The next prime is 189420853. The reversal of 189420851 is 158024981.

189420851 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 a de Polignac number, because none of the positive numbers 2^k-189420851 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (189420853) 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, 1460 + ... + 19518.

It is an arithmetic number, because the mean of its divisors is an integer number (25112430).

Almost surely, 2^189420851 is an apocalyptic number.

189420851 is a deficient number, since it is larger than the sum of its proper divisors (11478589).

189420851 is a wasteful number, since it uses less digits than its factorization.

189420851 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18693.

The product of its (nonzero) digits is 23040, while the sum is 38.

The square root of 189420851 is about 13763.0247765526. The cubic root of 189420851 is about 574.3049962026.

The spelling of 189420851 in words is "one hundred eighty-nine million, four hundred twenty thousand, eight hundred fifty-one".