19698993 has 12 divisors (see below), whose sum is σ = 28774980. Its totient is φ = 12984576.

The previous prime is 19698967. The next prime is 19698997. The reversal of 19698993 is 39989691.

It can be written as a sum of positive squares in 2 ways, for example, as 2782224 + 16916769 = 1668^2 + 4113^2 .

It is not a de Polignac number, because 19698993 - 2⁵ = 19698961 is a prime.

It is not an unprimeable number, because it can be changed into a prime (19698997) 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 11 ways as a sum of consecutive naturals, for example, 11496 + ... + 13097.

It is an arithmetic number, because the mean of its divisors is an integer number (2397915).

Almost surely, 2^19698993 is an apocalyptic number.

It is an amenable number.

19698993 is a deficient number, since it is larger than the sum of its proper divisors (9075987).

19698993 is a wasteful number, since it uses less digits than its factorization.

19698993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24688 (or 24685 counting only the distinct ones).

The product of its digits is 944784, while the sum is 54.

The square root of 19698993 is about 4438.3547627471. The cubic root of 19698993 is about 270.0731077749.

The spelling of 19698993 in words is "nineteen million, six hundred ninety-eight thousand, nine hundred ninety-three".