1987273 has 4 divisors (see below), whose sum is σ = 1993860. Its totient is φ = 1980688.

The previous prime is 1987261. The next prime is 1987277. The reversal of 1987273 is 3727891.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 328329 + 1658944 = 573^2 + 1288^2 .

It is a cyclic number.

It is not a de Polignac number, because 1987273 - 2⁵ = 1987241 is a prime.

It is a Duffinian number.

1987273 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1987277) 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, 2818 + ... + 3451.

It is an arithmetic number, because the mean of its divisors is an integer number (498465).

2^1987273 is an apocalyptic number.

It is an amenable number.

1987273 is a deficient number, since it is larger than the sum of its proper divisors (6587).

1987273 is an equidigital number, since it uses as much as digits as its factorization.

1987273 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6586.

The product of its digits is 21168, while the sum is 37.

The square root of 1987273 is about 1409.7067070848. The cubic root of 1987273 is about 125.7242858412.

The spelling of 1987273 in words is "one million, nine hundred eighty-seven thousand, two hundred seventy-three".