189856819 has 2 divisors, whose sum is σ = 189856820. Its totient is φ = 189856818.

The previous prime is 189856817. The next prime is 189856883. The reversal of 189856819 is 918658981.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 189856819 - 2¹ = 189856817 is a prime.

It is a super-2 number, since 2×189856819² = 72091223441597522, which contains 22 as substring.

Together with 189856817, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 189856819.

It is not a weakly prime, because it can be changed into another prime (189856811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94928409 + 94928410.

It is an arithmetic number, because the mean of its divisors is an integer number (94928410).

Almost surely, 2^189856819 is an apocalyptic number.

189856819 is a deficient number, since it is larger than the sum of its proper divisors (1).

189856819 is an equidigital number, since it uses as much as digits as its factorization.

189856819 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1244160, while the sum is 55.

The square root of 189856819 is about 13778.8540524965. The cubic root of 189856819 is about 574.7452623356.

The spelling of 189856819 in words is "one hundred eighty-nine million, eight hundred fifty-six thousand, eight hundred nineteen".