1803930493 has 4 divisors (see below), whose sum is σ = 1814732640. Its totient is φ = 1793128348.

The previous prime is 1803930467. The next prime is 1803930497. The reversal of 1803930493 is 3940393081.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 3940393081 = 1279 ⋅3080839.

It is a cyclic number.

It is not a de Polignac number, because 1803930493 - 2⁵ = 1803930461 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1803930497) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5400823 + ... + 5401156.

It is an arithmetic number, because the mean of its divisors is an integer number (453683160).

Almost surely, 2^1803930493 is an apocalyptic number.

It is an amenable number.

1803930493 is a deficient number, since it is larger than the sum of its proper divisors (10802147).

1803930493 is a wasteful number, since it uses less digits than its factorization.

1803930493 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10802146.

The product of its (nonzero) digits is 69984, while the sum is 40.

The square root of 1803930493 is about 42472.7029161084. The cubic root of 1803930493 is about 1217.3251647802.

The spelling of 1803930493 in words is "one billion, eight hundred three million, nine hundred thirty thousand, four hundred ninety-three".