1641656 has 16 divisors (see below), whose sum is σ = 3259440. Its totient is φ = 772480.

The previous prime is 1641641. The next prime is 1641659. The reversal of 1641656 is 6561461.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1641659) 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, 5900 + ... + 6171.

It is an arithmetic number, because the mean of its divisors is an integer number (203715).

2^1641656 is an apocalyptic number.

It is an amenable number.

1641656 is a deficient number, since it is larger than the sum of its proper divisors (1617784).

1641656 is a wasteful number, since it uses less digits than its factorization.

1641656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12094 (or 12090 counting only the distinct ones).

The product of its digits is 4320, while the sum is 29.

The square root of 1641656 is about 1281.2712437263. The cubic root of 1641656 is about 117.9670500742.

The spelling of 1641656 in words is "one million, six hundred forty-one thousand, six hundred fifty-six".