13947121 has 8 divisors (see below), whose sum is σ = 14789600. Its totient is φ = 13115520.

The previous prime is 13947119. The next prime is 13947139. The reversal of 13947121 is 12174931.

13947121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

13947121 is a nontrivial binomial coefficient, being equal to C(5282, 2).

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 13947121 - 2¹ = 13947119 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 13947121.

It is not an unprimeable number, because it can be changed into a prime (13947221) 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, 1 + ... + 5281.

It is an arithmetic number, because the mean of its divisors is an integer number (1848700).

Almost surely, 2^13947121 is an apocalyptic number.

13947121 is the 5281-st triangular number and also the 2641-st hexagonal number.

13947121 is the 1761-st centered nonagonal number.

It is an amenable number.

13947121 is a deficient number, since it is larger than the sum of its proper divisors (842479).

13947121 is a wasteful number, since it uses less digits than its factorization.

13947121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5439.

The product of its digits is 1512, while the sum is 28.

The square root of 13947121 is about 3734.5844481013. The cubic root of 13947121 is about 240.7104009228.

It can be divided in two parts, 1394 and 7121, that added together give a triangular number (8515 = T₁₃₀).

The spelling of 13947121 in words is "thirteen million, nine hundred forty-seven thousand, one hundred twenty-one".