190820389 has 2 divisors, whose sum is σ = 190820390. Its totient is φ = 190820388.

The previous prime is 190820353. The next prime is 190820417. The reversal of 190820389 is 983028091.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 109369764 + 81450625 = 10458^2 + 9025^2 .

It is an emirp because it is prime and its reverse (983028091) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 190820389 - 2¹³ = 190812197 is a prime.

It is a super-2 number, since 2×190820389² = 72824841716222642, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (190820339) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95410194 + 95410195.

It is an arithmetic number, because the mean of its divisors is an integer number (95410195).

Almost surely, 2^190820389 is an apocalyptic number.

It is an amenable number.

190820389 is a deficient number, since it is larger than the sum of its proper divisors (1).

190820389 is an equidigital number, since it uses as much as digits as its factorization.

190820389 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 31104, while the sum is 40.

The square root of 190820389 is about 13813.7753347881. The cubic root of 190820389 is about 575.7159464989.

The spelling of 190820389 in words is "one hundred ninety million, eight hundred twenty thousand, three hundred eighty-nine".