13918821 has 16 divisors (see below), whose sum is σ = 21431424. Its totient is φ = 7870464.

The previous prime is 13918787. The next prime is 13918823. The reversal of 13918821 is 12881931.

It is not a de Polignac number, because 13918821 - 2¹⁴ = 13902437 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13918823) 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, 1380 + ... + 5453.

It is an arithmetic number, because the mean of its divisors is an integer number (1339464).

Almost surely, 2^13918821 is an apocalyptic number.

It is an amenable number.

13918821 is a deficient number, since it is larger than the sum of its proper divisors (7512603).

13918821 is an equidigital number, since it uses as much as digits as its factorization.

13918821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6940.

The product of its digits is 3456, while the sum is 33.

The square root of 13918821 is about 3730.7936153049. The cubic root of 13918821 is about 240.5474827834.

The spelling of 13918821 in words is "thirteen million, nine hundred eighteen thousand, eight hundred twenty-one".