19004993 has 6 divisors (see below), whose sum is σ = 22107906. Its totient is φ = 16289952.

The previous prime is 19004989. The next prime is 19005001. The reversal of 19004993 is 39940091.

It can be written as a sum of positive squares in only one way, i.e., 12794929 + 6210064 = 3577^2 + 2492^2 .

It is not a de Polignac number, because 19004993 - 2² = 19004989 is a prime.

It is a super-2 number, since 2×19004993² = 722379517860098, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19004983) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 193880 + ... + 193977.

It is an arithmetic number, because the mean of its divisors is an integer number (3684651).

Almost surely, 2^19004993 is an apocalyptic number.

It is an amenable number.

19004993 is a deficient number, since it is larger than the sum of its proper divisors (3102913).

19004993 is an equidigital number, since it uses as much as digits as its factorization.

19004993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 387871 (or 387864 counting only the distinct ones).

The product of its (nonzero) digits is 8748, while the sum is 35.

The square root of 19004993 is about 4359.4716422980. The cubic root of 19004993 is about 266.8635370872.

The spelling of 19004993 in words is "nineteen million, four thousand, nine hundred ninety-three".