261930 has 16 divisors (see below), whose sum is σ = 628704. Its totient is φ = 69840.

The previous prime is 261917. The next prime is 261959. The reversal of 261930 is 39162.

261930 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 261897 and 261906.

It is an unprimeable number.

261930 is an untouchable number, because it is not equal to the sum of proper divisors of any 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 7 ways as a sum of consecutive naturals, for example, 4336 + ... + 4395.

It is an arithmetic number, because the mean of its divisors is an integer number (39294).

2²⁶¹⁹³⁰ is an apocalyptic number.

261930 is an abundant number, since it is smaller than the sum of its proper divisors (366774).

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

261930 is a wasteful number, since it uses less digits than its factorization.

261930 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8741.

The product of its (nonzero) digits is 324, while the sum is 21.

The square root of 261930 is about 511.7909729567. The cubic root of 261930 is about 63.9825798943.

The spelling of 261930 in words is "two hundred sixty-one thousand, nine hundred thirty".