1671885 has 24 divisors (see below), whose sum is σ = 2956824. Its totient is φ = 873600.

The previous prime is 1671781. The next prime is 1671907. The reversal of 1671885 is 5881761.

It can be written as a sum of positive squares in 4 ways, for example, as 594441 + 1077444 = 771^2 + 1038^2 .

It is not a de Polignac number, because 1671885 - 2⁷ = 1671757 is a prime.

It is a Curzon number.

1671885 is a lucky number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2035 + ... + 2735.

It is an arithmetic number, because the mean of its divisors is an integer number (123201).

2^1671885 is an apocalyptic number.

1671885 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1671885 is a deficient number, since it is larger than the sum of its proper divisors (1284939).

1671885 is a wasteful number, since it uses less digits than its factorization.

1671885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 765 (or 762 counting only the distinct ones).

The product of its digits is 13440, while the sum is 36.

The square root of 1671885 is about 1293.0139210387. The cubic root of 1671885 is about 118.6867215961.

Subtracting from 1671885 its sum of digits (36), we obtain a square (1671849 = 1293²).

It can be divided in two parts, 1671 and 885, that added together give a triangular number (2556 = T₇₁).

The spelling of 1671885 in words is "one million, six hundred seventy-one thousand, eight hundred eighty-five".