26206381 has 4 divisors (see below), whose sum is σ = 26219452. Its totient is φ = 26193312.

The previous prime is 26206379. The next prime is 26206391. The reversal of 26206381 is 18360262.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 18360262 = 2 ⋅9180131.

It can be written as a sum of positive squares in 2 ways, for example, as 8608356 + 17598025 = 2934^2 + 4195^2 .

It is a cyclic number.

It is not a de Polignac number, because 26206381 - 2¹ = 26206379 is a prime.

It is a super-2 number, since 2×26206381² = 1373548810234322, 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 (26206321) 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, 2826 + ... + 7771.

It is an arithmetic number, because the mean of its divisors is an integer number (6554863).

Almost surely, 2^26206381 is an apocalyptic number.

It is an amenable number.

26206381 is a deficient number, since it is larger than the sum of its proper divisors (13071).

26206381 is a wasteful number, since it uses less digits than its factorization.

26206381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13070.

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 26206381 is about 5119.2168346340. The cubic root of 26206381 is about 297.0313918154.

It can be divided in two parts, 262063 and 81, that added together give a 18-th power (262144 = 2¹⁸).

The spelling of 26206381 in words is "twenty-six million, two hundred six thousand, three hundred eighty-one".