1005646 has 8 divisors (see below), whose sum is σ = 1533384. Its totient is φ = 494520.

The previous prime is 1005643. The next prime is 1005647. The reversal of 1005646 is 6465001.

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

It is a super-2 number, since 2×1005646² = 2022647754632, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1005643) 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 3 ways as a sum of consecutive naturals, for example, 4000 + ... + 4243.

It is an arithmetic number, because the mean of its divisors is an integer number (191673).

2^1005646 is an apocalyptic number.

1005646 is a deficient number, since it is larger than the sum of its proper divisors (527738).

1005646 is an equidigital number, since it uses as much as digits as its factorization.

1005646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8306.

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 1005646 is about 1002.8190265447. The cubic root of 1005646 is about 100.1878469144.

It can be divided in two parts, 1005 and 646, that multiplied together give a triangular number (649230 = T₁₁₃₉).

The spelling of 1005646 in words is "one million, five thousand, six hundred forty-six".