1816503073 has 32 divisors (see below), whose sum is σ = 2400088320. Its totient is φ = 1333248000.

The previous prime is 1816503071. The next prime is 1816503089. The reversal of 1816503073 is 3703056181.

It is not a de Polignac number, because 1816503073 - 2¹ = 1816503071 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1816503071) 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 in 31 ways as a sum of consecutive naturals, for example, 81633 + ... + 101473.

It is an arithmetic number, because the mean of its divisors is an integer number (75002760).

Almost surely, 2^1816503073 is an apocalyptic number.

It is an amenable number.

1816503073 is a deficient number, since it is larger than the sum of its proper divisors (583585247).

1816503073 is a wasteful number, since it uses less digits than its factorization.

1816503073 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19929.

The product of its (nonzero) digits is 15120, while the sum is 34.

The square root of 1816503073 is about 42620.4536930333. The cubic root of 1816503073 is about 1220.1466886685.

The spelling of 1816503073 in words is "one billion, eight hundred sixteen million, five hundred three thousand, seventy-three".