19869912 has 96 divisors (see below), whose sum is σ = 56609280. Its totient is φ = 6289920.

The previous prime is 19869893. The next prime is 19869917. The reversal of 19869912 is 21996891.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19869917) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 156393 + ... + 156519.

It is an arithmetic number, because the mean of its divisors is an integer number (589680).

Almost surely, 2^19869912 is an apocalyptic number.

19869912 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19869912, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28304640).

19869912 is an abundant number, since it is smaller than the sum of its proper divisors (36739368).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

19869912 is a wasteful number, since it uses less digits than its factorization.

19869912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 233 (or 226 counting only the distinct ones).

The product of its digits is 69984, while the sum is 45.

The square root of 19869912 is about 4457.5679467620. The cubic root of 19869912 is about 270.8519591030.

The spelling of 19869912 in words is "nineteen million, eight hundred sixty-nine thousand, nine hundred twelve".