1987838 has 4 divisors (see below), whose sum is σ = 2981760. Its totient is φ = 993918.

The previous prime is 1987829. The next prime is 1987841. The reversal of 1987838 is 8387891.

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

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 496958 + ... + 496961.

It is an arithmetic number, because the mean of its divisors is an integer number (745440).

2^1987838 is an apocalyptic number.

1987838 is a deficient number, since it is larger than the sum of its proper divisors (993922).

1987838 is an equidigital number, since it uses as much as digits as its factorization.

1987838 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 993921.

The product of its digits is 96768, while the sum is 44.

The square root of 1987838 is about 1409.9070891374. The cubic root of 1987838 is about 125.7361995693.

The spelling of 1987838 in words is "one million, nine hundred eighty-seven thousand, eight hundred thirty-eight".