13919784 has 64 divisors (see below), whose sum is σ = 36771840. Its totient is φ = 4382400.

The previous prime is 13919783. The next prime is 13919803. The reversal of 13919784 is 48791931.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13919783) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 83269 + ... + 83435.

It is an arithmetic number, because the mean of its divisors is an integer number (574560).

Almost surely, 2^13919784 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 13919784, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18385920).

13919784 is an abundant number, since it is smaller than the sum of its proper divisors (22852056).

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

13919784 is a wasteful number, since it uses less digits than its factorization.

13919784 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 350 (or 346 counting only the distinct ones).

The product of its digits is 54432, while the sum is 42.

The square root of 13919784 is about 3730.9226740848. The cubic root of 13919784 is about 240.5530302332.

It can be divided in two parts, 1391 and 9784, that added together give a triangular number (11175 = T₁₄₉).

The spelling of 13919784 in words is "thirteen million, nine hundred nineteen thousand, seven hundred eighty-four".