189991292 has 6 divisors (see below), whose sum is σ = 332484768. Its totient is φ = 94995644.

The previous prime is 189991289. The next prime is 189991301. The reversal of 189991292 is 292199981.

189991292 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 189991292.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 23748908 + ... + 23748915.

It is an arithmetic number, because the mean of its divisors is an integer number (55414128).

Almost surely, 2^189991292 is an apocalyptic number.

It is an amenable number.

189991292 is a deficient number, since it is larger than the sum of its proper divisors (142493476).

189991292 is a wasteful number, since it uses less digits than its factorization.

189991292 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47497827 (or 47497825 counting only the distinct ones).

The product of its digits is 209952, while the sum is 50.

The square root of 189991292 is about 13783.7328761116. The cubic root of 189991292 is about 574.8809250593.

The spelling of 189991292 in words is "one hundred eighty-nine million, nine hundred ninety-one thousand, two hundred ninety-two".