189438890 has 16 divisors (see below), whose sum is σ = 350206632. Its totient is φ = 73727424.

The previous prime is 189438881. The next prime is 189438947. The reversal of 189438890 is 98834981.

It can be written as a sum of positive squares in 4 ways, for example, as 179051161 + 10387729 = 13381^2 + 3223^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 255629 + ... + 256368.

Almost surely, 2^189438890 is an apocalyptic number.

189438890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

189438890 is a deficient number, since it is larger than the sum of its proper divisors (160767742).

189438890 is a wasteful number, since it uses less digits than its factorization.

189438890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 512041.

The product of its (nonzero) digits is 497664, while the sum is 50.

The square root of 189438890 is about 13763.6801038094. The cubic root of 189438890 is about 574.3232264360.

The spelling of 189438890 in words is "one hundred eighty-nine million, four hundred thirty-eight thousand, eight hundred ninety".