189889450 has 48 divisors (see below), whose sum is σ = 364351680. Its totient is φ = 73584000.

The previous prime is 189889433. The next prime is 189889481. The reversal of 189889450 is 54988981.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 432331 + ... + 432769.

It is an arithmetic number, because the mean of its divisors is an integer number (7590660).

Almost surely, 2^189889450 is an apocalyptic number.

189889450 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

189889450 is a deficient number, since it is larger than the sum of its proper divisors (174462230).

189889450 is a wasteful number, since it uses less digits than its factorization.

189889450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 703 (or 698 counting only the distinct ones).

The product of its (nonzero) digits is 829440, while the sum is 52.

The square root of 189889450 is about 13780.0380986411. The cubic root of 189889450 is about 574.7781879167.

The spelling of 189889450 in words is "one hundred eighty-nine million, eight hundred eighty-nine thousand, four hundred fifty".