189966940 has 96 divisors (see below), whose sum is σ = 438177600. Its totient is φ = 68935680.

The previous prime is 189966929. The next prime is 189966943. The reversal of 189966940 is 49669981.

189966940 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Smith number, since the sum of its digits (52) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (189966943) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1386552 + ... + 1386688.

It is an arithmetic number, because the mean of its divisors is an integer number (4564350).

Almost surely, 2^189966940 is an apocalyptic number.

189966940 is a gapful number since it is divisible by the number (10) 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 189966940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (219088800).

189966940 is an abundant number, since it is smaller than the sum of its proper divisors (248210660).

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

189966940 is a wasteful number, since it uses less digits than its factorization.

189966940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 295 (or 293 counting only the distinct ones).

The product of its (nonzero) digits is 839808, while the sum is 52.

The square root of 189966940 is about 13782.8494876785. The cubic root of 189966940 is about 574.8563623573.

The spelling of 189966940 in words is "one hundred eighty-nine million, nine hundred sixty-six thousand, nine hundred forty".