261424 has 10 divisors (see below), whose sum is σ = 506540. Its totient is φ = 130704.

The previous prime is 261407. The next prime is 261427. The reversal of 261424 is 424162.

It is not an unprimeable number, because it can be changed into a prime (261427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8154 + ... + 8185.

It is an arithmetic number, because the mean of its divisors is an integer number (50654).

2²⁶¹⁴²⁴ is an apocalyptic number.

It is an amenable number.

261424 is a deficient number, since it is larger than the sum of its proper divisors (245116).

261424 is a wasteful number, since it uses less digits than its factorization.

261424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16347 (or 16341 counting only the distinct ones).

The product of its digits is 384, while the sum is 19.

The square root of 261424 is about 511.2963915382. The cubic root of 261424 is about 63.9413525238.

Adding to 261424 its reverse (424162), we get a palindrome (685586).

The spelling of 261424 in words is "two hundred sixty-one thousand, four hundred twenty-four".