26390231 has 4 divisors (see below), whose sum is σ = 30160272. Its totient is φ = 22620192.

The previous prime is 26390201. The next prime is 26390257. The reversal of 26390231 is 13209362.

26390231 = 1111² + 1112² + ... + 1131².

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13209362 = 2 ⋅6604681.

It is not a de Polignac number, because 26390231 - 2⁶ = 26390167 is a prime.

It is a super-2 number, since 2×26390231² = 1392888584466722, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 26390231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26390201) 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, 1885010 + ... + 1885023.

It is an arithmetic number, because the mean of its divisors is an integer number (7540068).

Almost surely, 2^26390231 is an apocalyptic number.

26390231 is a deficient number, since it is larger than the sum of its proper divisors (3770041).

26390231 is an equidigital number, since it uses as much as digits as its factorization.

26390231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3770040.

The product of its (nonzero) digits is 1944, while the sum is 26.

The square root of 26390231 is about 5137.1422989830. The cubic root of 26390231 is about 297.7243784297.

Adding to 26390231 its reverse (13209362), we get a palindrome (39599593).

The spelling of 26390231 in words is "twenty-six million, three hundred ninety thousand, two hundred thirty-one".