19863969 has 8 divisors (see below), whose sum is σ = 26507712. Its totient is φ = 13231440.

The previous prime is 19863953. The next prime is 19863971. The reversal of 19863969 is 96936891.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 19863969 - 2⁴ = 19863953 is a prime.

It is a super-2 number, since 2×19863969² = 789154528865922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (19863929) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3124 + ... + 7034.

It is an arithmetic number, because the mean of its divisors is an integer number (3313464).

Almost surely, 2^19863969 is an apocalyptic number.

It is an amenable number.

19863969 is a deficient number, since it is larger than the sum of its proper divisors (6643743).

19863969 is a wasteful number, since it uses less digits than its factorization.

19863969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5607.

The product of its digits is 629856, while the sum is 51.

The square root of 19863969 is about 4456.9012777938. The cubic root of 19863969 is about 270.8249528820.

The spelling of 19863969 in words is "nineteen million, eight hundred sixty-three thousand, nine hundred sixty-nine".