189420890 has 8 divisors (see below), whose sum is σ = 340957620. Its totient is φ = 75768352.

The previous prime is 189420877. The next prime is 189420901. The reversal of 189420890 is 98024981.

189420890 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 166848889 + 22572001 = 12917^2 + 4751^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9471035 + ... + 9471054.

Almost surely, 2^189420890 is an apocalyptic number.

189420890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

189420890 is a deficient number, since it is larger than the sum of its proper divisors (151536730).

189420890 is a wasteful number, since it uses less digits than its factorization.

189420890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18942096.

The product of its (nonzero) digits is 41472, while the sum is 41.

The square root of 189420890 is about 13763.0261933922. The cubic root of 189420890 is about 574.3050356173.

The spelling of 189420890 in words is "one hundred eighty-nine million, four hundred twenty thousand, eight hundred ninety".