13721730 has 64 divisors (see below), whose sum is σ = 36799488. Its totient is φ = 3245760.

The previous prime is 13721723. The next prime is 13721761. The reversal of 13721730 is 3712731.

It is a self number, because there is not a number n which added to its sum of digits gives 13721730.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 13707 + ... + 14673.

It is an arithmetic number, because the mean of its divisors is an integer number (574992).

Almost surely, 2^13721730 is an apocalyptic number.

13721730 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 13721730, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18399744).

13721730 is an abundant number, since it is smaller than the sum of its proper divisors (23077758).

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

13721730 is a wasteful number, since it uses less digits than its factorization.

13721730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1031.

The product of its (nonzero) digits is 882, while the sum is 24.

The square root of 13721730 is about 3704.2853561787. The cubic root of 13721730 is about 239.4066942152.

The spelling of 13721730 in words is "thirteen million, seven hundred twenty-one thousand, seven hundred thirty".