1641885 has 32 divisors (see below), whose sum is σ = 3164160. Its totient is φ = 710208.

The previous prime is 1641881. The next prime is 1641889. The reversal of 1641885 is 5881461.

It is an interprime number because it is at equal distance from previous prime (1641881) and next prime (1641889).

It is not a de Polignac number, because 1641885 - 2² = 1641881 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1641881) 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 31 ways as a sum of consecutive naturals, for example, 1584 + ... + 2406.

It is an arithmetic number, because the mean of its divisors is an integer number (98880).

2^1641885 is an apocalyptic number.

1641885 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1641885 is a deficient number, since it is larger than the sum of its proper divisors (1522275).

1641885 is a wasteful number, since it uses less digits than its factorization.

1641885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 857.

The product of its digits is 7680, while the sum is 33.

The square root of 1641885 is about 1281.3606049821. The cubic root of 1641885 is about 117.9725350232.

The spelling of 1641885 in words is "one million, six hundred forty-one thousand, eight hundred eighty-five".