13867021 has 16 divisors (see below), whose sum is σ = 16372224. Its totient is φ = 11499264.

The previous prime is 13866977. The next prime is 13867031. The reversal of 13867021 is 12076831.

13867021 = 8² + 9² + ... + 346².

It is not a de Polignac number, because 13867021 - 2¹⁹ = 13342733 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 (13867031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 36991 + ... + 37363.

It is an arithmetic number, because the mean of its divisors is an integer number (1023264).

Almost surely, 2^13867021 is an apocalyptic number.

It is an amenable number.

13867021 is a deficient number, since it is larger than the sum of its proper divisors (2505203).

13867021 is a wasteful number, since it uses less digits than its factorization.

13867021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 540.

The product of its (nonzero) digits is 2016, while the sum is 28.

The square root of 13867021 is about 3723.8449215831. The cubic root of 13867021 is about 240.2487063029.

The spelling of 13867021 in words is "thirteen million, eight hundred sixty-seven thousand, twenty-one".