1987220 has 24 divisors (see below), whose sum is σ = 4238304. Its totient is φ = 782496.

The previous prime is 1987217. The next prime is 1987231. The reversal of 1987220 is 227891.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 599 + ... + 2081.

It is an arithmetic number, because the mean of its divisors is an integer number (176596).

2^1987220 is an apocalyptic number.

1987220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1987220 is an abundant number, since it is smaller than the sum of its proper divisors (2251084).

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

1987220 is a wasteful number, since it uses less digits than its factorization.

1987220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1559 (or 1557 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 29.

The square root of 1987220 is about 1409.6879087231. The cubic root of 1987220 is about 125.7231681544.

The spelling of 1987220 in words is "one million, nine hundred eighty-seven thousand, two hundred twenty".