26398649 has 4 divisors (see below), whose sum is σ = 27112164. Its totient is φ = 25685136.

The previous prime is 26398643. The next prime is 26398651. The reversal of 26398649 is 94689362.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 94689362 = 2 ⋅47344681.

It can be written as a sum of positive squares in 2 ways, for example, as 20430400 + 5968249 = 4520^2 + 2443^2 .

It is a cyclic number.

It is not a de Polignac number, because 26398649 - 2²⁴ = 9621433 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (26398643) 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, 356702 + ... + 356775.

It is an arithmetic number, because the mean of its divisors is an integer number (6778041).

Almost surely, 2^26398649 is an apocalyptic number.

It is an amenable number.

26398649 is a deficient number, since it is larger than the sum of its proper divisors (713515).

26398649 is an equidigital number, since it uses as much as digits as its factorization.

26398649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 713514.

The product of its digits is 559872, while the sum is 47.

The square root of 26398649 is about 5137.9615607749. The cubic root of 26398649 is about 297.7560312710.

The spelling of 26398649 in words is "twenty-six million, three hundred ninety-eight thousand, six hundred forty-nine".