13457809 has 4 divisors (see below), whose sum is σ = 13563904. Its totient is φ = 13351716.

The previous prime is 13457767. The next prime is 13457831. The reversal of 13457809 is 90875431.

13457809 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 a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 90875431 = 2711 ⋅33521.

It is a cyclic number.

It is not a de Polignac number, because 13457809 - 2¹³ = 13449617 is a prime.

It is a super-2 number, since 2×13457809² = 362225246160962, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13457849) 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, 52857 + ... + 53110.

It is an arithmetic number, because the mean of its divisors is an integer number (3390976).

Almost surely, 2^13457809 is an apocalyptic number.

It is an amenable number.

13457809 is a deficient number, since it is larger than the sum of its proper divisors (106095).

13457809 is a wasteful number, since it uses less digits than its factorization.

13457809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106094.

The product of its (nonzero) digits is 30240, while the sum is 37.

The square root of 13457809 is about 3668.4886533830. The cubic root of 13457809 is about 237.8618469449.

The spelling of 13457809 in words is "thirteen million, four hundred fifty-seven thousand, eight hundred nine".