1671985 has 32 divisors (see below), whose sum is σ = 2506752. Its totient is φ = 1045440.

The previous prime is 1671983. The next prime is 1671997. The reversal of 1671985 is 5891761.

It is not a de Polignac number, because 1671985 - 2¹ = 1671983 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1671983) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 24922 + ... + 24988.

It is an arithmetic number, because the mean of its divisors is an integer number (78336).

2^1671985 is an apocalyptic number.

It is an amenable number.

1671985 is a deficient number, since it is larger than the sum of its proper divisors (834767).

1671985 is a wasteful number, since it uses less digits than its factorization.

1671985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133.

The product of its digits is 15120, while the sum is 37.

The square root of 1671985 is about 1293.0525898045. The cubic root of 1671985 is about 118.6890878744.

The spelling of 1671985 in words is "one million, six hundred seventy-one thousand, nine hundred eighty-five".