14397821 has 4 divisors (see below), whose sum is σ = 14669532. Its totient is φ = 14126112.

The previous prime is 14397809. The next prime is 14397841. The reversal of 14397821 is 12879341.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12879341 = 631 ⋅20411.

It can be written as a sum of positive squares in 2 ways, for example, as 5812921 + 8584900 = 2411^2 + 2930^2 .

It is a cyclic number.

It is not a de Polignac number, because 14397821 - 2¹⁰ = 14396797 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (14397841) 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, 135776 + ... + 135881.

It is an arithmetic number, because the mean of its divisors is an integer number (3667383).

Almost surely, 2^14397821 is an apocalyptic number.

It is an amenable number.

14397821 is a deficient number, since it is larger than the sum of its proper divisors (271711).

14397821 is an equidigital number, since it uses as much as digits as its factorization.

14397821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 271710.

The product of its digits is 12096, while the sum is 35.

The square root of 14397821 is about 3794.4460728807. The cubic root of 14397821 is about 243.2758077982.

The spelling of 14397821 in words is "fourteen million, three hundred ninety-seven thousand, eight hundred twenty-one".