1987243 has 4 divisors (see below), whose sum is σ = 1994848. Its totient is φ = 1979640.

The previous prime is 1987241. The next prime is 1987247. The reversal of 1987243 is 3427891.

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

It is a cyclic number.

It is not a de Polignac number, because 1987243 - 2¹ = 1987241 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1987199 and 1987208.

It is not an unprimeable number, because it can be changed into a prime (1987241) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3396 + ... + 3937.

It is an arithmetic number, because the mean of its divisors is an integer number (498712).

2^1987243 is an apocalyptic number.

1987243 is a deficient number, since it is larger than the sum of its proper divisors (7605).

1987243 is an equidigital number, since it uses as much as digits as its factorization.

1987243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7604.

The product of its digits is 12096, while the sum is 34.

The square root of 1987243 is about 1409.6960665335. The cubic root of 1987243 is about 125.7236531907.

The spelling of 1987243 in words is "one million, nine hundred eighty-seven thousand, two hundred forty-three".