1838145779 has 2 divisors, whose sum is σ = 1838145780. Its totient is φ = 1838145778.

The previous prime is 1838145731. The next prime is 1838145797. The reversal of 1838145779 is 9775418381.

Together with next prime (1838145797) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is an emirp because it is prime and its reverse (9775418381) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1838145779 - 2²⁰ = 1837097203 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1838145779.

It is not a weakly prime, because it can be changed into another prime (1838145719) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 919072889 + 919072890.

It is an arithmetic number, because the mean of its divisors is an integer number (919072890).

Almost surely, 2^1838145779 is an apocalyptic number.

1838145779 is a deficient number, since it is larger than the sum of its proper divisors (1).

1838145779 is an equidigital number, since it uses as much as digits as its factorization.

1838145779 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1693440, while the sum is 53.

The square root of 1838145779 is about 42873.6023562285. The cubic root of 1838145779 is about 1224.9733780692.

The spelling of 1838145779 in words is "one billion, eight hundred thirty-eight million, one hundred forty-five thousand, seven hundred seventy-nine".