189998656 has 21 divisors (see below), whose sum is σ = 377247531. Its totient is φ = 94944192.

The previous prime is 189998621. The next prime is 189998671. The reversal of 189998656 is 656899981.

It is a happy number.

The square root of 189998656 is 13784.

It is a perfect power (a square), and thus also a powerful number.

It is a super-3 number, since 3×189998656³ (a number of 26 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 189998594 and 189998603.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 109411 + ... + 111133.

Almost surely, 2^189998656 is an apocalyptic number.

189998656 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

189998656 is the 13784-th square number.

It is an amenable number.

189998656 is a deficient number, since it is larger than the sum of its proper divisors (187248875).

189998656 is an frugal number, since it uses more digits than its factorization.

189998656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3458 (or 1725 counting only the distinct ones).

The product of its digits is 8398080, while the sum is 61.

The cubic root of 189998656 is about 574.8883523619. Note that the first 3 decimals are identical.

The spelling of 189998656 in words is "one hundred eighty-nine million, nine hundred ninety-eight thousand, six hundred fifty-six".