13405597 has 4 divisors (see below), whose sum is σ = 13483260. Its totient is φ = 13327936.

The previous prime is 13405549. The next prime is 13405607. The reversal of 13405597 is 79550431.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 79550431 = 1499 ⋅53069.

It can be written as a sum of positive squares in 2 ways, for example, as 5447556 + 7958041 = 2334^2 + 2821^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13405597 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 (13405097) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 38572 + ... + 38917.

It is an arithmetic number, because the mean of its divisors is an integer number (3370815).

Almost surely, 2^13405597 is an apocalyptic number.

It is an amenable number.

13405597 is a deficient number, since it is larger than the sum of its proper divisors (77663).

13405597 is an equidigital number, since it uses as much as digits as its factorization.

13405597 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77662.

The product of its (nonzero) digits is 18900, while the sum is 34.

The square root of 13405597 is about 3661.3654556736. The cubic root of 13405597 is about 237.5538389485.

The spelling of 13405597 in words is "thirteen million, four hundred five thousand, five hundred ninety-seven".