26840381 has 4 divisors (see below), whose sum is σ = 26850912. Its totient is φ = 26829852.

The previous prime is 26840351. The next prime is 26840423. The reversal of 26840381 is 18304862.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-26840381 is a prime.

It is a super-2 number, since 2×26840381² = 1440812104450322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26840311) 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, 1226 + ... + 7428.

It is an arithmetic number, because the mean of its divisors is an integer number (6712728).

Almost surely, 2^26840381 is an apocalyptic number.

It is an amenable number.

26840381 is a deficient number, since it is larger than the sum of its proper divisors (10531).

26840381 is an equidigital number, since it uses as much as digits as its factorization.

26840381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10530.

The product of its (nonzero) digits is 9216, while the sum is 32.

The square root of 26840381 is about 5180.7703095196. The cubic root of 26840381 is about 299.4076496920.

The spelling of 26840381 in words is "twenty-six million, eight hundred forty thousand, three hundred eighty-one".