1644166 has 8 divisors (see below), whose sum is σ = 2512944. Its totient is φ = 806520.

The previous prime is 1644163. The next prime is 1644173. The reversal of 1644166 is 6614461.

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

It is a super-3 number, since 3×1644166³ = 13333932247316298888, which contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1644163) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7650 + ... + 7861.

It is an arithmetic number, because the mean of its divisors is an integer number (314118).

2^1644166 is an apocalyptic number.

1644166 is a deficient number, since it is larger than the sum of its proper divisors (868778).

1644166 is a wasteful number, since it uses less digits than its factorization.

1644166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15566.

The product of its digits is 3456, while the sum is 28.

The square root of 1644166 is about 1282.2503655683. The cubic root of 1644166 is about 118.0271411282.

The spelling of 1644166 in words is "one million, six hundred forty-four thousand, one hundred sixty-six".