1641855 has 16 divisors (see below), whose sum is σ = 2741760. Its totient is φ = 837408.

The previous prime is 1641841. The next prime is 1641863. The reversal of 1641855 is 5581461.

It is not a de Polignac number, because 1641855 - 2¹² = 1637759 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2035 + ... + 2724.

It is an arithmetic number, because the mean of its divisors is an integer number (171360).

2^1641855 is an apocalyptic number.

1641855 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1641855 is a deficient number, since it is larger than the sum of its proper divisors (1099905).

1641855 is a wasteful number, since it uses less digits than its factorization.

1641855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4790.

The product of its digits is 4800, while the sum is 30.

The square root of 1641855 is about 1281.3488986221. The cubic root of 1641855 is about 117.9718165000.

The spelling of 1641855 in words is "one million, six hundred forty-one thousand, eight hundred fifty-five".