13869421 has 4 divisors (see below), whose sum is σ = 14006844. Its totient is φ = 13732000.

The previous prime is 13869419. The next prime is 13869451. The reversal of 13869421 is 12496831.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12496831 = 101 ⋅123731.

It can be written as a sum of positive squares in 2 ways, for example, as 12859396 + 1010025 = 3586^2 + 1005^2 .

It is a cyclic number.

It is not a de Polignac number, because 13869421 - 2¹ = 13869419 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 (13869451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 68560 + ... + 68761.

It is an arithmetic number, because the mean of its divisors is an integer number (3501711).

Almost surely, 2^13869421 is an apocalyptic number.

It is an amenable number.

13869421 is a deficient number, since it is larger than the sum of its proper divisors (137423).

13869421 is a wasteful number, since it uses less digits than its factorization.

13869421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137422.

The product of its digits is 10368, while the sum is 34.

The square root of 13869421 is about 3724.1671552174. The cubic root of 13869421 is about 240.2625656515.

The spelling of 13869421 in words is "thirteen million, eight hundred sixty-nine thousand, four hundred twenty-one".