1820398747 has 2 divisors, whose sum is σ = 1820398748. Its totient is φ = 1820398746.

The previous prime is 1820398669. The next prime is 1820398751. The reversal of 1820398747 is 7478930281.

It is a strong prime.

It is an emirp because it is prime and its reverse (7478930281) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1820398747 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1820398747.

It is not a weakly prime, because it can be changed into another prime (1820398787) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 910199373 + 910199374.

It is an arithmetic number, because the mean of its divisors is an integer number (910199374).

Almost surely, 2^1820398747 is an apocalyptic number.

1820398747 is a deficient number, since it is larger than the sum of its proper divisors (1).

1820398747 is an equidigital number, since it uses as much as digits as its factorization.

1820398747 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 677376, while the sum is 49.

The square root of 1820398747 is about 42666.1311463789. The cubic root of 1820398747 is about 1221.0183084072.

The spelling of 1820398747 in words is "one billion, eight hundred twenty million, three hundred ninety-eight thousand, seven hundred forty-seven".