13463721 has 12 divisors (see below), whose sum is σ = 19482372. Its totient is φ = 8959776.

The previous prime is 13463701. The next prime is 13463729. The reversal of 13463721 is 12736431.

13463721 is a `hidden beast` number, since 1 + 3 + 4 + 637 + 21 = 666.

13463721 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 7485696 + 5978025 = 2736^2 + 2445^2 .

It is not a de Polignac number, because 13463721 - 2⁵ = 13463689 is a prime.

It is not an unprimeable number, because it can be changed into a prime (13463729) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6235 + ... + 8111.

It is an arithmetic number, because the mean of its divisors is an integer number (1623531).

Almost surely, 2^13463721 is an apocalyptic number.

It is an amenable number.

13463721 is a deficient number, since it is larger than the sum of its proper divisors (6018651).

13463721 is a wasteful number, since it uses less digits than its factorization.

13463721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2680 (or 2677 counting only the distinct ones).

The product of its digits is 3024, while the sum is 27.

The square root of 13463721 is about 3669.2943463287. The cubic root of 13463721 is about 237.8966726576.

The spelling of 13463721 in words is "thirteen million, four hundred sixty-three thousand, seven hundred twenty-one".