13720440 has 64 divisors (see below), whose sum is σ = 42134400. Its totient is φ = 3572352.

The previous prime is 13720439. The next prime is 13720463. The reversal of 13720440 is 4402731.

It is a congruent number.

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 15 ways as a sum of consecutive naturals, for example, 3831 + ... + 6489.

It is an arithmetic number, because the mean of its divisors is an integer number (658350).

Almost surely, 2^13720440 is an apocalyptic number.

13720440 is a gapful number since it is divisible by the number (10) 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 13720440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21067200).

13720440 is an abundant number, since it is smaller than the sum of its proper divisors (28413960).

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

13720440 is a wasteful number, since it uses less digits than its factorization.

13720440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2716 (or 2712 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 21.

The square root of 13720440 is about 3704.1112294314. Note that the first 3 decimals coincide. The cubic root of 13720440 is about 239.3991916551.

The spelling of 13720440 in words is "thirteen million, seven hundred twenty thousand, four hundred forty".