26399641 has 4 divisors (see below), whose sum is σ = 26832484. Its totient is φ = 25966800.

The previous prime is 26399629. The next prime is 26399663. The reversal of 26399641 is 14699362.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4347225 + 22052416 = 2085^2 + 4696^2 .

It is a cyclic number.

It is not a de Polignac number, because 26399641 - 2⁹ = 26399129 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 26399594 and 26399603.

It is not an unprimeable number, because it can be changed into a prime (26399441) 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, 216330 + ... + 216451.

It is an arithmetic number, because the mean of its divisors is an integer number (6708121).

Almost surely, 2^26399641 is an apocalyptic number.

It is an amenable number.

26399641 is a deficient number, since it is larger than the sum of its proper divisors (432843).

26399641 is an equidigital number, since it uses as much as digits as its factorization.

26399641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 432842.

The product of its digits is 69984, while the sum is 40.

The square root of 26399641 is about 5138.0580962072. The cubic root of 26399641 is about 297.7597608847.

The spelling of 26399641 in words is "twenty-six million, three hundred ninety-nine thousand, six hundred forty-one".