190009889 has 2 divisors, whose sum is σ = 190009890. Its totient is φ = 190009888.

The previous prime is 190009871. The next prime is 190009921. The reversal of 190009889 is 988900091.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 171819664 + 18190225 = 13108^2 + 4265^2 .

It is a cyclic number.

It is not a de Polignac number, because 190009889 - 2²⁰ = 188961313 is a prime.

It is a super-2 number, since 2×190009889² = 72207515835584642, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (190009829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95004944 + 95004945.

It is an arithmetic number, because the mean of its divisors is an integer number (95004945).

Almost surely, 2^190009889 is an apocalyptic number.

It is an amenable number.

190009889 is a deficient number, since it is larger than the sum of its proper divisors (1).

190009889 is an equidigital number, since it uses as much as digits as its factorization.

190009889 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 46656, while the sum is 44.

The square root of 190009889 is about 13784.4074591547. The cubic root of 190009889 is about 574.8996815536.

The spelling of 190009889 in words is "one hundred ninety million, nine thousand, eight hundred eighty-nine".