1643116 has 24 divisors (see below), whose sum is σ = 3027024. Its totient is φ = 779520.

The previous prime is 1643099. The next prime is 1643123. The reversal of 1643116 is 6113461.

1643116 = T₄₃ + T₄₄ + ... + T₂₁₄.

It is a happy number.

It is a hoax number, since the sum of its digits (22) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6936 + ... + 7168.

It is an arithmetic number, because the mean of its divisors is an integer number (126126).

2^1643116 is an apocalyptic number.

It is an amenable number.

1643116 is a deficient number, since it is larger than the sum of its proper divisors (1383908).

1643116 is a wasteful number, since it uses less digits than its factorization.

1643116 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 321 (or 319 counting only the distinct ones).

The product of its digits is 432, while the sum is 22.

The square root of 1643116 is about 1281.8408637581. The cubic root of 1643116 is about 118.0020108821.

Adding to 1643116 its reverse (6113461), we get a palindrome (7756577).

The spelling of 1643116 in words is "one million, six hundred forty-three thousand, one hundred sixteen".