1671887 has 4 divisors (see below), whose sum is σ = 1910736. Its totient is φ = 1433040.

The previous prime is 1671781. The next prime is 1671907. The reversal of 1671887 is 7881761.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7881761 = 17 ⋅463633.

It is not a de Polignac number, because 1671887 - 2¹⁰ = 1670863 is a prime.

It is a super-2 number, since 2×1671887² = 5590412281538, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1671887.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1670887) 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 3 ways as a sum of consecutive naturals, for example, 119414 + ... + 119427.

It is an arithmetic number, because the mean of its divisors is an integer number (477684).

2^1671887 is an apocalyptic number.

1671887 is a deficient number, since it is larger than the sum of its proper divisors (238849).

1671887 is an equidigital number, since it uses as much as digits as its factorization.

1671887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 238848.

The product of its digits is 18816, while the sum is 38.

The square root of 1671887 is about 1293.0146944254. The cubic root of 1671887 is about 118.6867689226.

Subtracting from 1671887 its sum of digits (38), we obtain a square (1671849 = 1293²).

The spelling of 1671887 in words is "one million, six hundred seventy-one thousand, eight hundred eighty-seven".