13408993 has 4 divisors (see below), whose sum is σ = 14440468. Its totient is φ = 12377520.

The previous prime is 13408987. The next prime is 13409017. The reversal of 13408993 is 39980431.

13408993 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 39980431 = 139 ⋅287629.

It can be written as a sum of positive squares in 2 ways, for example, as 1520289 + 11888704 = 1233^2 + 3448^2 .

It is a cyclic number.

It is not a de Polignac number, because 13408993 - 2⁵ = 13408961 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13408963) 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, 515718 + ... + 515743.

It is an arithmetic number, because the mean of its divisors is an integer number (3610117).

Almost surely, 2^13408993 is an apocalyptic number.

13408993 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

13408993 is a deficient number, since it is larger than the sum of its proper divisors (1031475).

13408993 is a wasteful number, since it uses less digits than its factorization.

13408993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1031474.

The product of its (nonzero) digits is 23328, while the sum is 37.

The square root of 13408993 is about 3661.8291877148. The cubic root of 13408993 is about 237.5738968573.

The spelling of 13408993 in words is "thirteen million, four hundred eight thousand, nine hundred ninety-three".