13428993 has 4 divisors (see below), whose sum is σ = 17905328. Its totient is φ = 8952660.

The previous prime is 13428977. The next prime is 13429027. The reversal of 13428993 is 39982431.

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: 39982431 = 3 ⋅13327477.

It is not a de Polignac number, because 13428993 - 2⁴ = 13428977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13428913) 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, 2238163 + ... + 2238168.

It is an arithmetic number, because the mean of its divisors is an integer number (4476332).

Almost surely, 2^13428993 is an apocalyptic number.

It is an amenable number.

13428993 is a deficient number, since it is larger than the sum of its proper divisors (4476335).

13428993 is an equidigital number, since it uses as much as digits as its factorization.

13428993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4476334.

The product of its digits is 46656, while the sum is 39.

The square root of 13428993 is about 3664.5590457789. The cubic root of 13428993 is about 237.6919548789.

The spelling of 13428993 in words is "thirteen million, four hundred twenty-eight thousand, nine hundred ninety-three".