1987878 has 16 divisors (see below), whose sum is σ = 4209840. Its totient is φ = 623616.

The previous prime is 1987873. The next prime is 1987879. The reversal of 1987878 is 8787891.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1987873) 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 7 ways as a sum of consecutive naturals, for example, 9643 + ... + 9846.

It is an arithmetic number, because the mean of its divisors is an integer number (263115).

2^1987878 is an apocalyptic number.

1987878 is an abundant number, since it is smaller than the sum of its proper divisors (2221962).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1987878 is a wasteful number, since it uses less digits than its factorization.

1987878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19511.

The product of its digits is 225792, while the sum is 48.

The square root of 1987878 is about 1409.9212743980. The cubic root of 1987878 is about 125.7370429335.

The spelling of 1987878 in words is "one million, nine hundred eighty-seven thousand, eight hundred seventy-eight".