189491536 has 40 divisors (see below), whose sum is σ = 402864840. Its totient is φ = 85802496.

The previous prime is 189491527. The next prime is 189491557. The reversal of 189491536 is 635194981.

It can be written as a sum of positive squares in 4 ways, for example, as 55950400 + 133541136 = 7480^2 + 11556^2 .

It is a Smith number, since the sum of its digits (46) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2430 + ... + 19618.

It is an arithmetic number, because the mean of its divisors is an integer number (10071621).

Almost surely, 2^189491536 is an apocalyptic number.

189491536 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 189491536, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (201432420).

189491536 is an abundant number, since it is smaller than the sum of its proper divisors (213373304).

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

189491536 is a wasteful number, since it uses less digits than its factorization.

189491536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17263 (or 17257 counting only the distinct ones).

The product of its digits is 233280, while the sum is 46.

The square root of 189491536 is about 13765.5924681795. The cubic root of 189491536 is about 574.3764239256.

The spelling of 189491536 in words is "one hundred eighty-nine million, four hundred ninety-one thousand, five hundred thirty-six".