1987893 has 6 divisors (see below), whose sum is σ = 2871414. Its totient is φ = 1325256.

The previous prime is 1987891. The next prime is 1987901. The reversal of 1987893 is 3987891.

It can be written as a sum of positive squares in only one way, i.e., 1954404 + 33489 = 1398^2 + 183^2 .

It is not a de Polignac number, because 1987893 - 2¹ = 1987891 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1987891) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 110430 + ... + 110447.

It is an arithmetic number, because the mean of its divisors is an integer number (478569).

2^1987893 is an apocalyptic number.

It is an amenable number.

1987893 is a deficient number, since it is larger than the sum of its proper divisors (883521).

1987893 is a wasteful number, since it uses less digits than its factorization.

1987893 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 220883 (or 220880 counting only the distinct ones).

The product of its digits is 108864, while the sum is 45.

The square root of 1987893 is about 1409.9265938339. The cubic root of 1987893 is about 125.7373591921.

The spelling of 1987893 in words is "one million, nine hundred eighty-seven thousand, eight hundred ninety-three".