19993669 has 2 divisors, whose sum is σ = 19993670. Its totient is φ = 19993668.

The previous prime is 19993663. The next prime is 19993709. The reversal of 19993669 is 96639991.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19980900 + 12769 = 4470^2 + 113^2 .

It is a cyclic number.

It is not a de Polignac number, because 19993669 - 2³ = 19993661 is a prime.

It is a super-2 number, since 2×19993669² = 799493600163122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19993661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9996834 + 9996835.

It is an arithmetic number, because the mean of its divisors is an integer number (9996835).

Almost surely, 2^19993669 is an apocalyptic number.

It is an amenable number.

19993669 is a deficient number, since it is larger than the sum of its proper divisors (1).

19993669 is an equidigital number, since it uses as much as digits as its factorization.

19993669 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 708588, while the sum is 52.

The square root of 19993669 is about 4471.4280716567. The cubic root of 19993669 is about 271.4131170069.

The spelling of 19993669 in words is "nineteen million, nine hundred ninety-three thousand, six hundred sixty-nine".