26404513 has 4 divisors (see below), whose sum is σ = 26431108. Its totient is φ = 26377920.

The previous prime is 26404493. The next prime is 26404559. The reversal of 26404513 is 31540462.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 31540462 = 2 ⋅15770231.

It can be written as a sum of positive squares in 2 ways, for example, as 23882769 + 2521744 = 4887^2 + 1588^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-26404513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (26404013) 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, 11748 + ... + 13813.

It is an arithmetic number, because the mean of its divisors is an integer number (6607777).

Almost surely, 2^26404513 is an apocalyptic number.

It is an amenable number.

26404513 is a deficient number, since it is larger than the sum of its proper divisors (26595).

26404513 is a wasteful number, since it uses less digits than its factorization.

26404513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26594.

The product of its (nonzero) digits is 2880, while the sum is 25.

The square root of 26404513 is about 5138.5321834158. The cubic root of 26404513 is about 297.7780767439.

Adding to 26404513 its reverse (31540462), we get a palindrome (57944975).

The spelling of 26404513 in words is "twenty-six million, four hundred four thousand, five hundred thirteen".