13860821 has 4 divisors (see below), whose sum is σ = 14927052. Its totient is φ = 12794592.

The previous prime is 13860809. The next prime is 13860827. The reversal of 13860821 is 12806831.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2937796 + 10923025 = 1714^2 + 3305^2 .

It is a cyclic number.

It is not a de Polignac number, because 13860821 - 2⁶ = 13860757 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 (13860827) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 533096 + ... + 533121.

It is an arithmetic number, because the mean of its divisors is an integer number (3731763).

Almost surely, 2^13860821 is an apocalyptic number.

It is an amenable number.

13860821 is a deficient number, since it is larger than the sum of its proper divisors (1066231).

13860821 is a wasteful number, since it uses less digits than its factorization.

13860821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1066230.

The product of its (nonzero) digits is 2304, while the sum is 29.

The square root of 13860821 is about 3723.0123556067. The cubic root of 13860821 is about 240.2128955827.

The spelling of 13860821 in words is "thirteen million, eight hundred sixty thousand, eight hundred twenty-one".