13916421 has 16 divisors (see below), whose sum is σ = 21830400. Its totient is φ = 8731584.

The previous prime is 13916411. The next prime is 13916429. The reversal of 13916421 is 12461931.

13916421 is a `hidden beast` number, since 13 + 9 + 1 + 642 + 1 = 666.

It is not a de Polignac number, because 13916421 - 2¹⁰ = 13915397 is a prime.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13916429) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14701 + ... + 15618.

It is an arithmetic number, because the mean of its divisors is an integer number (1364400).

Almost surely, 2^13916421 is an apocalyptic number.

It is an amenable number.

13916421 is a deficient number, since it is larger than the sum of its proper divisors (7913979).

13916421 is a wasteful number, since it uses less digits than its factorization.

13916421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30345 (or 30339 counting only the distinct ones).

The product of its digits is 1296, while the sum is 27.

The square root of 13916421 is about 3730.4719540562. The cubic root of 13916421 is about 240.5336562497.

The spelling of 13916421 in words is "thirteen million, nine hundred sixteen thousand, four hundred twenty-one".