1987964 has 12 divisors (see below), whose sum is σ = 3795288. Its totient is φ = 903600.

The previous prime is 1987939. The next prime is 1987969. The reversal of 1987964 is 4697891.

It is a Harshad number since it is a multiple of its sum of digits (44), and also a Moran number because the ratio is a prime number: 45181 = 1987964 / (1 + 9 + 8 + 7 + 9 + 6 + 4).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1987969) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22547 + ... + 22634.

It is an arithmetic number, because the mean of its divisors is an integer number (316274).

2^1987964 is an apocalyptic number.

It is an amenable number.

1987964 is a deficient number, since it is larger than the sum of its proper divisors (1807324).

1987964 is a wasteful number, since it uses less digits than its factorization.

1987964 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45196 (or 45194 counting only the distinct ones).

The product of its digits is 108864, while the sum is 44.

The square root of 1987964 is about 1409.9517722249. The cubic root of 1987964 is about 125.7388561282.

The spelling of 1987964 in words is "one million, nine hundred eighty-seven thousand, nine hundred sixty-four".