1638363343 has 2 divisors, whose sum is σ = 1638363344. Its totient is φ = 1638363342.

The previous prime is 1638363329. The next prime is 1638363379. The reversal of 1638363343 is 3433638361.

It is a weak prime.

It is an emirp because it is prime and its reverse (3433638361) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1638363343 - 2¹³ = 1638355151 is a prime.

It is a super-3 number, since 3×1638363343³ (a number of 29 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a junction number, because it is equal to n+sod(n) for n = 1638363296 and 1638363305.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1638363043) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 819181671 + 819181672.

It is an arithmetic number, because the mean of its divisors is an integer number (819181672).

Almost surely, 2^1638363343 is an apocalyptic number.

1638363343 is a deficient number, since it is larger than the sum of its proper divisors (1).

1638363343 is an equidigital number, since it uses as much as digits as its factorization.

1638363343 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 279936, while the sum is 40.

The square root of 1638363343 is about 40476.7012366374. The cubic root of 1638363343 is about 1178.8812874718.

The spelling of 1638363343 in words is "one billion, six hundred thirty-eight million, three hundred sixty-three thousand, three hundred forty-three".