13491720 has 96 divisors (see below), whose sum is σ = 47848320. Its totient is φ = 3269760.

The previous prime is 13491703. The next prime is 13491721. The reversal of 13491720 is 2719431.

13491720 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (13491721) 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, 2257 + ... + 5663.

It is an arithmetic number, because the mean of its divisors is an integer number (498420).

Almost surely, 2^13491720 is an apocalyptic number.

13491720 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 13491720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23924160).

13491720 is an abundant number, since it is smaller than the sum of its proper divisors (34356600).

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

13491720 is a wasteful number, since it uses less digits than its factorization.

13491720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3435 (or 3428 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 27.

The square root of 13491720 is about 3673.1076760694. The cubic root of 13491720 is about 238.0614675405.

The spelling of 13491720 in words is "thirteen million, four hundred ninety-one thousand, seven hundred twenty".