189904936 has 64 divisors (see below), whose sum is σ = 395176320. Its totient is φ = 85013760.

The previous prime is 189904927. The next prime is 189904937. The reversal of 189904936 is 639409981.

It is a self number, because there is not a number n which added to its sum of digits gives 189904936.

It is not an unprimeable number, because it can be changed into a prime (189904937) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 721941 + ... + 722203.

It is an arithmetic number, because the mean of its divisors is an integer number (6174630).

Almost surely, 2^189904936 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 189904936, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (197588160).

189904936 is an abundant number, since it is smaller than the sum of its proper divisors (205271384).

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

189904936 is a wasteful number, since it uses less digits than its factorization.

189904936 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 466 (or 462 counting only the distinct ones).

The product of its (nonzero) digits is 419904, while the sum is 49.

The square root of 189904936 is about 13780.5999869382. The cubic root of 189904936 is about 574.7938123990.

The spelling of 189904936 in words is "one hundred eighty-nine million, nine hundred four thousand, nine hundred thirty-six".