189986816 has 24 divisors (see below), whose sum is σ = 379884960. Its totient is φ = 94992384.

The previous prime is 189986813. The next prime is 189986837. The reversal of 189986816 is 618689981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (189986813) by changing a digit.

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 as a sum of consecutive naturals, namely, 44336 + ... + 48431.

It is an arithmetic number, because the mean of its divisors is an integer number (15828540).

Almost surely, 2^189986816 is an apocalyptic number.

189986816 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

189986816 is a deficient number, since it is larger than the sum of its proper divisors (189898144).

189986816 is an frugal number, since it uses more digits than its factorization.

189986816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92789 (or 92769 counting only the distinct ones).

The product of its digits is 1492992, while the sum is 56.

The square root of 189986816 is about 13783.5705098498. The cubic root of 189986816 is about 574.8764104888.

The spelling of 189986816 in words is "one hundred eighty-nine million, nine hundred eighty-six thousand, eight hundred sixteen".