13699421 has 4 divisors (see below), whose sum is σ = 14295072. Its totient is φ = 13103772.

The previous prime is 13699409. The next prime is 13699451. The reversal of 13699421 is 12499631.

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 13699421 - 2¹⁰ = 13698397 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13699451) 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 3 ways as a sum of consecutive naturals, for example, 297791 + ... + 297836.

It is an arithmetic number, because the mean of its divisors is an integer number (3573768).

Almost surely, 2^13699421 is an apocalyptic number.

It is an amenable number.

13699421 is a deficient number, since it is larger than the sum of its proper divisors (595651).

13699421 is an equidigital number, since it uses as much as digits as its factorization.

13699421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 595650.

The product of its digits is 11664, while the sum is 35.

The square root of 13699421 is about 3701.2728891558. The cubic root of 13699421 is about 239.2768801415.

The spelling of 13699421 in words is "thirteen million, six hundred ninety-nine thousand, four hundred twenty-one".