189687906 has 40 divisors (see below), whose sum is σ = 447419280. Its totient is φ = 59900472.

The previous prime is 189687893. The next prime is 189687917. The reversal of 189687906 is 609786981.

It is a Harshad number since it is a multiple of its sum of digits (54).

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 19 ways as a sum of consecutive naturals, for example, 27736 + ... + 33891.

It is an arithmetic number, because the mean of its divisors is an integer number (11185482).

Almost surely, 2^189687906 is an apocalyptic number.

189687906 is an abundant number, since it is smaller than the sum of its proper divisors (257731374).

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

189687906 is a wasteful number, since it uses less digits than its factorization.

189687906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61660 (or 61651 counting only the distinct ones).

The product of its (nonzero) digits is 1306368, while the sum is 54.

The square root of 189687906 is about 13772.7232601254. The cubic root of 189687906 is about 574.5747641112.

The spelling of 189687906 in words is "one hundred eighty-nine million, six hundred eighty-seven thousand, nine hundred six".