261394 has 8 divisors (see below), whose sum is σ = 448128. Its totient is φ = 112020.

The previous prime is 261389. The next prime is 261407. The reversal of 261394 is 493162.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a nialpdrome in base 8.

It is an unprimeable number.

261394 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 (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9322 + ... + 9349.

It is an arithmetic number, because the mean of its divisors is an integer number (56016).

261394 is a Friedman number, since it can be written as 4^9-21-3^6, using all its digits and the basic arithmetic operations.

2²⁶¹³⁹⁴ is an apocalyptic number.

261394 is a deficient number, since it is larger than the sum of its proper divisors (186734).

261394 is a wasteful number, since it uses less digits than its factorization.

261394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18680.

The product of its digits is 1296, while the sum is 25.

The square root of 261394 is about 511.2670535053. The cubic root of 261394 is about 63.9389065434.

The spelling of 261394 in words is "two hundred sixty-one thousand, three hundred ninety-four".