261368 has 16 divisors (see below), whose sum is σ = 503880. Its totient is φ = 127008.

The previous prime is 261353. The next prime is 261379. The reversal of 261368 is 863162.

It is a zygodrome in base 2.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 146 + ... + 737.

2²⁶¹³⁶⁸ is an apocalyptic number.

It is an amenable number.

261368 is a deficient number, since it is larger than the sum of its proper divisors (242512).

261368 is a wasteful number, since it uses less digits than its factorization.

261368 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 926 (or 922 counting only the distinct ones).

The product of its digits is 1728, while the sum is 26.

The square root of 261368 is about 511.2416258483. The cubic root of 261368 is about 63.9367865423.

The spelling of 261368 in words is "two hundred sixty-one thousand, three hundred sixty-eight".