189889870 has 16 divisors (see below), whose sum is σ = 349075008. Its totient is φ = 74339680.

The previous prime is 189889841. The next prime is 189889877. The reversal of 189889870 is 78988981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (189889877) 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, 201541 + ... + 202480.

It is an arithmetic number, because the mean of its divisors is an integer number (21817188).

Almost surely, 2^189889870 is an apocalyptic number.

189889870 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

189889870 is a deficient number, since it is larger than the sum of its proper divisors (159185138).

189889870 is a wasteful number, since it uses less digits than its factorization.

189889870 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 404075.

The product of its (nonzero) digits is 2322432, while the sum is 58.

The square root of 189889870 is about 13780.0533380680. The cubic root of 189889870 is about 574.7786116837.

The spelling of 189889870 in words is "one hundred eighty-nine million, eight hundred eighty-nine thousand, eight hundred seventy".