1987164 has 54 divisors (see below), whose sum is σ = 5363904. Its totient is φ = 620160.

The previous prime is 1987157. The next prime is 1987189. The reversal of 1987164 is 4617891.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

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 17 ways as a sum of consecutive naturals, for example, 10309 + ... + 10499.

2^1987164 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1987164, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2681952).

1987164 is an abundant number, since it is smaller than the sum of its proper divisors (3376740).

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

1987164 is a wasteful number, since it uses less digits than its factorization.

1987164 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 235 (or 213 counting only the distinct ones).

The product of its digits is 12096, while the sum is 36.

The square root of 1987164 is about 1409.6680460307. The cubic root of 1987164 is about 125.7219871807.

The spelling of 1987164 in words is "one million, nine hundred eighty-seven thousand, one hundred sixty-four".