14391721 has 8 divisors (see below), whose sum is σ = 15808320. Its totient is φ = 13041072.

The previous prime is 14391709. The next prime is 14391733. The reversal of 14391721 is 12719341.

14391721 = T₅ + T₆ + ... + T₄₄₁.

It is an interprime number because it is at equal distance from previous prime (14391709) and next prime (14391733).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 14391721 - 2⁷ = 14391593 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 14391721.

It is not an unprimeable number, because it can be changed into a prime (14311721) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16030 + ... + 16903.

It is an arithmetic number, because the mean of its divisors is an integer number (1976040).

Almost surely, 2^14391721 is an apocalyptic number.

It is an amenable number.

14391721 is a deficient number, since it is larger than the sum of its proper divisors (1416599).

14391721 is a wasteful number, since it uses less digits than its factorization.

14391721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32975.

The product of its digits is 1512, while the sum is 28.

The square root of 14391721 is about 3793.6421813344. The cubic root of 14391721 is about 243.2414463012.

It can be divided in two parts, 1439 and 1721, that added together give a triangular number (3160 = T₇₉).

The spelling of 14391721 in words is "fourteen million, three hundred ninety-one thousand, seven hundred twenty-one".