14405721 has 16 divisors (see below), whose sum is σ = 21677760. Its totient is φ = 8429120.

The previous prime is 14405707. The next prime is 14405753. The reversal of 14405721 is 12750441.

It is a cyclic number.

It is not a de Polignac number, because 14405721 - 2⁵ = 14405689 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 14405691 and 14405700.

It is not an unprimeable number, because it can be changed into a prime (14405701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6570 + ... + 8483.

It is an arithmetic number, because the mean of its divisors is an integer number (1354860).

Almost surely, 2^14405721 is an apocalyptic number.

14405721 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

14405721 is a deficient number, since it is larger than the sum of its proper divisors (7272039).

14405721 is a wasteful number, since it uses less digits than its factorization.

14405721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15096.

The product of its (nonzero) digits is 1120, while the sum is 24.

The square root of 14405721 is about 3795.4869252838. The cubic root of 14405721 is about 243.3202943327.

The spelling of 14405721 in words is "fourteen million, four hundred five thousand, seven hundred twenty-one".