1987903 has 4 divisors (see below), whose sum is σ = 1992928. Its totient is φ = 1982880.

The previous prime is 1987901. The next prime is 1987919. The reversal of 1987903 is 3097891.

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 1987903 - 2¹ = 1987901 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1987901) 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, 1863 + ... + 2728.

It is an arithmetic number, because the mean of its divisors is an integer number (498232).

2^1987903 is an apocalyptic number.

1987903 is a deficient number, since it is larger than the sum of its proper divisors (5025).

1987903 is an equidigital number, since it uses as much as digits as its factorization.

1987903 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5024.

The product of its (nonzero) digits is 13608, while the sum is 37.

The square root of 1987903 is about 1409.9301401133. The cubic root of 1987903 is about 125.7375700304.

The spelling of 1987903 in words is "one million, nine hundred eighty-seven thousand, nine hundred three".