1838365493 has 2 divisors, whose sum is σ = 1838365494. Its totient is φ = 1838365492.

The previous prime is 1838365481. The next prime is 1838365523. The reversal of 1838365493 is 3945638381.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1428991204 + 409374289 = 37802^2 + 20233^2 .

It is an emirp because it is prime and its reverse (3945638381) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1838365493 - 2⁸ = 1838365237 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1838361493) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 919182746 + 919182747.

It is an arithmetic number, because the mean of its divisors is an integer number (919182747).

Almost surely, 2^1838365493 is an apocalyptic number.

It is an amenable number.

1838365493 is a deficient number, since it is larger than the sum of its proper divisors (1).

1838365493 is an equidigital number, since it uses as much as digits as its factorization.

1838365493 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1866240, while the sum is 50.

The square root of 1838365493 is about 42876.1646255819. The cubic root of 1838365493 is about 1225.0221832440.

The spelling of 1838365493 in words is "one billion, eight hundred thirty-eight million, three hundred sixty-five thousand, four hundred ninety-three".