261435 has 16 divisors (see below), whose sum is σ = 433440. Its totient is φ = 134400.

The previous prime is 261433. The next prime is 261439. The reversal of 261435 is 534162.

It is a happy number.

It is not a de Polignac number, because 261435 - 2¹ = 261433 is a prime.

261435 is a lucky number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 261435.

It is not an unprimeable number, because it can be changed into a prime (261431) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 135 + ... + 735.

It is an arithmetic number, because the mean of its divisors is an integer number (27090).

2²⁶¹⁴³⁵ is an apocalyptic number.

261435 is a deficient number, since it is larger than the sum of its proper divisors (172005).

261435 is a wasteful number, since it uses less digits than its factorization.

261435 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 638.

The product of its digits is 720, while the sum is 21.

The square root of 261435 is about 511.3071483952. The cubic root of 261435 is about 63.9422493364.

Adding to 261435 its reverse (534162), we get a palindrome (795597).

It can be divided in two parts, 261 and 435, that added together give a palindrome (696).

The spelling of 261435 in words is "two hundred sixty-one thousand, four hundred thirty-five".