13721543 has 8 divisors (see below), whose sum is σ = 15027456. Its totient is φ = 12425400.

The previous prime is 13721537. The next prime is 13721563. The reversal of 13721543 is 34512731.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 13721543 - 2⁴ = 13721527 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13721563) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 680 + ... + 5282.

It is an arithmetic number, because the mean of its divisors is an integer number (1878432).

Almost surely, 2^13721543 is an apocalyptic number.

13721543 is a deficient number, since it is larger than the sum of its proper divisors (1305913).

13721543 is a wasteful number, since it uses less digits than its factorization.

13721543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4885.

The product of its digits is 2520, while the sum is 26.

The square root of 13721543 is about 3704.2601150567. The cubic root of 13721543 is about 239.4056066639.

The spelling of 13721543 in words is "thirteen million, seven hundred twenty-one thousand, five hundred forty-three".