19764993 has 32 divisors (see below), whose sum is σ = 28651392. Its totient is φ = 12096000.

The previous prime is 19764989. The next prime is 19765013. The reversal of 19764993 is 39946791.

It is not a de Polignac number, because 19764993 - 2² = 19764989 is a prime.

It is not an unprimeable number, because it can be changed into a prime (19764923) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 195643 + ... + 195743.

It is an arithmetic number, because the mean of its divisors is an integer number (895356).

Almost surely, 2^19764993 is an apocalyptic number.

It is an amenable number.

19764993 is a deficient number, since it is larger than the sum of its proper divisors (8886399).

19764993 is a wasteful number, since it uses less digits than its factorization.

19764993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 225.

The product of its digits is 367416, while the sum is 48.

The square root of 19764993 is about 4445.7837329317. The cubic root of 19764993 is about 270.3743914525.

The spelling of 19764993 in words is "nineteen million, seven hundred sixty-four thousand, nine hundred ninety-three".