14478421 has 2 divisors, whose sum is σ = 14478422. Its totient is φ = 14478420.

The previous prime is 14478419. The next prime is 14478449. The reversal of 14478421 is 12487441.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7349521 + 7128900 = 2711^2 + 2670^2 .

It is a cyclic number.

It is not a de Polignac number, because 14478421 - 2¹ = 14478419 is a prime.

Together with 14478419, it forms a pair of twin primes.

It is equal to p₉₃₉₁₇₂ and since 14478421 and 939172 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (14478461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7239210 + 7239211.

It is an arithmetic number, because the mean of its divisors is an integer number (7239211).

Almost surely, 2^14478421 is an apocalyptic number.

It is an amenable number.

14478421 is a deficient number, since it is larger than the sum of its proper divisors (1).

14478421 is an equidigital number, since it uses as much as digits as its factorization.

14478421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7168, while the sum is 31.

The square root of 14478421 is about 3805.0520364379. The cubic root of 14478421 is about 243.7289216049.

The spelling of 14478421 in words is "fourteen million, four hundred seventy-eight thousand, four hundred twenty-one".