261826 has 16 divisors (see below), whose sum is σ = 419328. Its totient is φ = 122400.

The previous prime is 261823. The next prime is 261847. The reversal of 261826 is 628162.

It is a self number, because there is not a number n which added to its sum of digits gives 261826.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261823) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2491 + ... + 2593.

It is an arithmetic number, because the mean of its divisors is an integer number (26208).

2²⁶¹⁸²⁶ is an apocalyptic number.

261826 is a deficient number, since it is larger than the sum of its proper divisors (157502).

261826 is a wasteful number, since it uses less digits than its factorization.

261826 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 177.

The product of its digits is 1152, while the sum is 25.

The square root of 261826 is about 511.6893588888. The cubic root of 261826 is about 63.9741106224.

Adding to 261826 its reverse (628162), we get a palindrome (889988).

The spelling of 261826 in words is "two hundred sixty-one thousand, eight hundred twenty-six".