14405981 has 4 divisors (see below), whose sum is σ = 15032352. Its totient is φ = 13779612.

The previous prime is 14405977. The next prime is 14405999. The reversal of 14405981 is 18950441.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 18950441 = 79 ⋅239879.

It is a cyclic number.

It is not a de Polignac number, because 14405981 - 2² = 14405977 is a prime.

It is a super-2 number, since 2×14405981² = 415064577144722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (14405581) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 313151 + ... + 313196.

It is an arithmetic number, because the mean of its divisors is an integer number (3758088).

Almost surely, 2^14405981 is an apocalyptic number.

It is an amenable number.

14405981 is a deficient number, since it is larger than the sum of its proper divisors (626371).

14405981 is an equidigital number, since it uses as much as digits as its factorization.

14405981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 626370.

The product of its (nonzero) digits is 5760, while the sum is 32.

The square root of 14405981 is about 3795.5211763340. The cubic root of 14405981 is about 243.3217581700.

The spelling of 14405981 in words is "fourteen million, four hundred five thousand, nine hundred eighty-one".