189889994 has 24 divisors (see below), whose sum is σ = 340300260. Its totient is φ = 79180416.

The previous prime is 189889981. The next prime is 189890023. The reversal of 189889994 is 499988981.

It can be written as a sum of positive squares in 2 ways, for example, as 168610225 + 21279769 = 12985^2 + 4613^2 .

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 189889994.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 22559 + ... + 29810.

Almost surely, 2^189889994 is an apocalyptic number.

189889994 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

189889994 is a deficient number, since it is larger than the sum of its proper divisors (150410266).

189889994 is a wasteful number, since it uses less digits than its factorization.

189889994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52422 (or 52415 counting only the distinct ones).

The product of its digits is 13436928, while the sum is 65.

The square root of 189889994 is about 13780.0578373242. The cubic root of 189889994 is about 574.7787367958.

It can be divided in two parts, 18988 and 9994, that added together give a palindrome (28982).

The spelling of 189889994 in words is "one hundred eighty-nine million, eight hundred eighty-nine thousand, nine hundred ninety-four".