189998782 has 4 divisors (see below), whose sum is σ = 284998176. Its totient is φ = 94999390.

The previous prime is 189998747. The next prime is 189998789. The reversal of 189998782 is 287899981.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 287899981 = 17 ⋅16935293.

It is a super-2 number, since 2×189998782² = 72199074322967048, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 189998782.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (189998789) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 47499694 + ... + 47499697.

It is an arithmetic number, because the mean of its divisors is an integer number (71249544).

Almost surely, 2^189998782 is an apocalyptic number.

189998782 is a deficient number, since it is larger than the sum of its proper divisors (94999394).

189998782 is an equidigital number, since it uses as much as digits as its factorization.

189998782 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94999393.

The product of its digits is 5225472, while the sum is 61.

The square root of 189998782 is about 13784.0045705158. The cubic root of 189998782 is about 574.8884794433. Note that the first 3 decimals are identical.

The spelling of 189998782 in words is "one hundred eighty-nine million, nine hundred ninety-eight thousand, seven hundred eighty-two".