19994312 has 64 divisors (see below), whose sum is σ = 43908480. Its totient is φ = 8451072.

The previous prime is 19994309. The next prime is 19994321. The reversal of 19994312 is 21349991.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 75893 + ... + 76155.

It is an arithmetic number, because the mean of its divisors is an integer number (686070).

Almost surely, 2^19994312 is an apocalyptic number.

It is a pronic number, being equal to 4471×4472.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19994312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21954240).

19994312 is an abundant number, since it is smaller than the sum of its proper divisors (23914168).

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

19994312 is a wasteful number, since it uses less digits than its factorization.

19994312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 342 (or 338 counting only the distinct ones).

The product of its digits is 17496, while the sum is 38.

The square root of 19994312 is about 4471.4999720452. The cubic root of 19994312 is about 271.4160265406.

The spelling of 19994312 in words is "nineteen million, nine hundred ninety-four thousand, three hundred twelve".