189537138 has 64 divisors (see below), whose sum is σ = 482976000. Its totient is φ = 53972352.

The previous prime is 189537121. The next prime is 189537167. The reversal of 189537138 is 831735981.

189537138 is a `hidden beast` number, since 1 + 89 + 537 + 1 + 38 = 666.

189537138 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 189537093 and 189537102.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 146398 + ... + 147686.

It is an arithmetic number, because the mean of its divisors is an integer number (7546500).

Almost surely, 2^189537138 is an apocalyptic number.

189537138 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 189537138, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (241488000).

189537138 is an abundant number, since it is smaller than the sum of its proper divisors (293438862).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

189537138 is a wasteful number, since it uses less digits than its factorization.

189537138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1696 (or 1690 counting only the distinct ones).

The product of its digits is 181440, while the sum is 45.

The square root of 189537138 is about 13767.2487447565. The cubic root of 189537138 is about 574.4224956629.

The spelling of 189537138 in words is "one hundred eighty-nine million, five hundred thirty-seven thousand, one hundred thirty-eight".