1816123403 has 2 divisors, whose sum is σ = 1816123404. Its totient is φ = 1816123402.

The previous prime is 1816123399. The next prime is 1816123423. The reversal of 1816123403 is 3043216181.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1816123403 - 2² = 1816123399 is a prime.

It is not a weakly prime, because it can be changed into another prime (1816123423) 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, 908061701 + 908061702.

It is an arithmetic number, because the mean of its divisors is an integer number (908061702).

Almost surely, 2^1816123403 is an apocalyptic number.

1816123403 is a deficient number, since it is larger than the sum of its proper divisors (1).

1816123403 is an equidigital number, since it uses as much as digits as its factorization.

1816123403 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3456, while the sum is 29.

The square root of 1816123403 is about 42615.9993781678. Note that the first 3 decimals coincide. The cubic root of 1816123403 is about 1220.0616745225.

Adding to 1816123403 its reverse (3043216181), we get a palindrome (4859339584).

The spelling of 1816123403 in words is "one billion, eight hundred sixteen million, one hundred twenty-three thousand, four hundred three".