13919724 has 108 divisors (see below), whose sum is σ = 44151744. Its totient is φ = 3665088.

The previous prime is 13919701. The next prime is 13919743. The reversal of 13919724 is 42791931.

It is a Harshad number since it is a multiple of its sum of digits (36).

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 22629 + ... + 23235.

Almost surely, 2^13919724 is an apocalyptic number.

13919724 is a gapful number since it is divisible by the number (14) 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 13919724, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22075872).

13919724 is an abundant number, since it is smaller than the sum of its proper divisors (30232020).

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

13919724 is a wasteful number, since it uses less digits than its factorization.

13919724 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 644 (or 632 counting only the distinct ones).

The product of its digits is 13608, while the sum is 36.

The square root of 13919724 is about 3730.9146331697. The cubic root of 13919724 is about 240.5526846052.

The spelling of 13919724 in words is "thirteen million, nine hundred nineteen thousand, seven hundred twenty-four".