189782947 has 4 divisors (see below), whose sum is σ = 189810720. Its totient is φ = 189755176.

The previous prime is 189782941. The next prime is 189782981. The reversal of 189782947 is 749287981.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 749287981 = 13 ⋅57637537.

It is a cyclic number.

It is not a de Polignac number, because 189782947 - 2⁷ = 189782819 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (189782941) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4329 + ... + 19957.

It is an arithmetic number, because the mean of its divisors is an integer number (47452680).

Almost surely, 2^189782947 is an apocalyptic number.

189782947 is a deficient number, since it is larger than the sum of its proper divisors (27773).

189782947 is a wasteful number, since it uses less digits than its factorization.

189782947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27772.

The product of its digits is 2032128, while the sum is 55.

The square root of 189782947 is about 13776.1731623844. The cubic root of 189782947 is about 574.6707095048.

The spelling of 189782947 in words is "one hundred eighty-nine million, seven hundred eighty-two thousand, nine hundred forty-seven".