26826981 has 4 divisors (see below), whose sum is σ = 35769312. Its totient is φ = 17884652.

The previous prime is 26826977. The next prime is 26826983. The reversal of 26826981 is 18962862.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 26826981 - 2² = 26826977 is a prime.

It is a super-2 number, since 2×26826981² = 1439373819148722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26826983) 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, 4471161 + ... + 4471166.

It is an arithmetic number, because the mean of its divisors is an integer number (8942328).

Almost surely, 2^26826981 is an apocalyptic number.

It is an amenable number.

26826981 is a deficient number, since it is larger than the sum of its proper divisors (8942331).

26826981 is an equidigital number, since it uses as much as digits as its factorization.

26826981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8942330.

The product of its digits is 82944, while the sum is 42.

The square root of 26826981 is about 5179.4769040898. The cubic root of 26826981 is about 299.3578151987.

The spelling of 26826981 in words is "twenty-six million, eight hundred twenty-six thousand, nine hundred eighty-one".