1587220 has 24 divisors (see below), whose sum is σ = 3390408. Its totient is φ = 624000.

The previous prime is 1587197. The next prime is 1587221. The reversal of 1587220 is 227851.

It can be written as a sum of positive squares in 4 ways, for example, as 190096 + 1397124 = 436^2 + 1182^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1587221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 570 + ... + 1870.

It is an arithmetic number, because the mean of its divisors is an integer number (141267).

2^1587220 is an apocalyptic number.

1587220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1587220 is an abundant number, since it is smaller than the sum of its proper divisors (1803188).

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

1587220 is a wasteful number, since it uses less digits than its factorization.

1587220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1371 (or 1369 counting only the distinct ones).

The product of its (nonzero) digits is 1120, while the sum is 25.

The square root of 1587220 is about 1259.8491973248. The cubic root of 1587220 is about 116.6484688169.

The spelling of 1587220 in words is "one million, five hundred eighty-seven thousand, two hundred twenty".