13723421 has 4 divisors (see below), whose sum is σ = 14166144. Its totient is φ = 13280700.

The previous prime is 13723417. The next prime is 13723439. The reversal of 13723421 is 12432731.

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.

It is a cyclic number.

It is not a de Polignac number, because 13723421 - 2² = 13723417 is a prime.

It is a super-3 number, since 3×13723421³ (a number of 22 digits) contains 333 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 (13723441) 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 3 ways as a sum of consecutive naturals, for example, 221315 + ... + 221376.

It is an arithmetic number, because the mean of its divisors is an integer number (3541536).

Almost surely, 2^13723421 is an apocalyptic number.

It is an amenable number.

13723421 is a deficient number, since it is larger than the sum of its proper divisors (442723).

13723421 is an equidigital number, since it uses as much as digits as its factorization.

13723421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 442722.

The product of its digits is 1008, while the sum is 23.

The square root of 13723421 is about 3704.5135983014. The cubic root of 13723421 is about 239.4165282544.

The spelling of 13723421 in words is "thirteen million, seven hundred twenty-three thousand, four hundred twenty-one".