13992221 has 8 divisors (see below), whose sum is σ = 14238840. Its totient is φ = 13747968.

The previous prime is 13992217. The next prime is 13992233. The reversal of 13992221 is 12229931.

It can be written as a sum of positive squares in 4 ways, for example, as 931225 + 13060996 = 965^2 + 3614^2 .

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 13992221 - 2² = 13992217 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 (13992271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14465 + ... + 15401.

It is an arithmetic number, because the mean of its divisors is an integer number (1779855).

Almost surely, 2^13992221 is an apocalyptic number.

It is an amenable number.

13992221 is a deficient number, since it is larger than the sum of its proper divisors (246619).

13992221 is a wasteful number, since it uses less digits than its factorization.

13992221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1183.

The product of its digits is 1944, while the sum is 29.

The square root of 13992221 is about 3740.6177297340. The cubic root of 13992221 is about 240.9695788693.

The spelling of 13992221 in words is "thirteen million, nine hundred ninety-two thousand, two hundred twenty-one".