261908 has 12 divisors (see below), whose sum is σ = 469812. Its totient is φ = 127680.

The previous prime is 261887. The next prime is 261917. The reversal of 261908 is 809162.

It can be written as a sum of positive squares in 2 ways, for example, as 29584 + 232324 = 172^2 + 482^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 635 + ... + 962.

It is an arithmetic number, because the mean of its divisors is an integer number (39151).

2²⁶¹⁹⁰⁸ is an apocalyptic number.

It is an amenable number.

261908 is a deficient number, since it is larger than the sum of its proper divisors (207904).

261908 is a wasteful number, since it uses less digits than its factorization.

261908 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1642 (or 1640 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 26.

The square root of 261908 is about 511.7694793557. The cubic root of 261908 is about 63.9807885045.

The spelling of 261908 in words is "two hundred sixty-one thousand, nine hundred eight".