189863472839 has 4 divisors (see below), whose sum is σ = 189864376224. Its totient is φ = 189862569456.

The previous prime is 189863472739. The next prime is 189863472863. The reversal of 189863472839 is 938274368981.

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: 938274368981 = 203311 ⋅4614971.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-189863472839 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (189863472739) 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, 47339 + ... + 618035.

It is an arithmetic number, because the mean of its divisors is an integer number (47466094056).

Almost surely, 2^189863472839 is an apocalyptic number.

189863472839 is a deficient number, since it is larger than the sum of its proper divisors (903385).

189863472839 is an equidigital number, since it uses as much as digits as its factorization.

189863472839 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 903384.

The product of its digits is 125411328, while the sum is 68.

The spelling of 189863472839 in words is "one hundred eighty-nine billion, eight hundred sixty-three million, four hundred seventy-two thousand, eight hundred thirty-nine".