14278921 has 2 divisors, whose sum is σ = 14278922. Its totient is φ = 14278920.

The previous prime is 14278919. The next prime is 14278949. The reversal of 14278921 is 12987241.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12924025 + 1354896 = 3595^2 + 1164^2 .

It is a cyclic number.

It is not a de Polignac number, because 14278921 - 2¹ = 14278919 is a prime.

Together with 14278919, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (14278961) 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 as a sum of consecutive naturals, namely, 7139460 + 7139461.

It is an arithmetic number, because the mean of its divisors is an integer number (7139461).

Almost surely, 2^14278921 is an apocalyptic number.

It is an amenable number.

14278921 is a deficient number, since it is larger than the sum of its proper divisors (1).

14278921 is an equidigital number, since it uses as much as digits as its factorization.

14278921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8064, while the sum is 34.

The square root of 14278921 is about 3778.7459560018. The cubic root of 14278921 is about 242.6042829198.

The spelling of 14278921 in words is "fourteen million, two hundred seventy-eight thousand, nine hundred twenty-one".