1005861 has 8 divisors (see below), whose sum is σ = 1347840. Its totient is φ = 667232.

The previous prime is 1005833. The next prime is 1005883. The reversal of 1005861 is 1685001.

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

It is a cyclic number.

It is not a de Polignac number, because 1005861 - 2⁹ = 1005349 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1005821) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 21 + ... + 1418.

It is an arithmetic number, because the mean of its divisors is an integer number (168480).

2^1005861 is an apocalyptic number.

It is an amenable number.

1005861 is a deficient number, since it is larger than the sum of its proper divisors (341979).

1005861 is a wasteful number, since it uses less digits than its factorization.

1005861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1675.

The product of its (nonzero) digits is 240, while the sum is 21.

The square root of 1005861 is about 1002.9262186223. The cubic root of 1005861 is about 100.1949862233.

The spelling of 1005861 in words is "one million, five thousand, eight hundred sixty-one".