261996 has 24 divisors (see below), whose sum is σ = 698880. Its totient is φ = 74832.

The previous prime is 261983. The next prime is 262007. The reversal of 261996 is 699162.

It is a happy number.

It is a nialpdrome in base 8.

It is an unprimeable number.

261996 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1476 + ... + 1643.

It is an arithmetic number, because the mean of its divisors is an integer number (29120).

2²⁶¹⁹⁹⁶ is an apocalyptic number.

It is an amenable number.

261996 is an abundant number, since it is smaller than the sum of its proper divisors (436884).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

261996 is a wasteful number, since it uses less digits than its factorization.

261996 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3133 (or 3131 counting only the distinct ones).

The product of its digits is 5832, while the sum is 33.

The square root of 261996 is about 511.8554483445. The cubic root of 261996 is about 63.9879534618.

The spelling of 261996 in words is "two hundred sixty-one thousand, nine hundred ninety-six".