1087220 has 12 divisors (see below), whose sum is σ = 2283204. Its totient is φ = 434880.

The previous prime is 1087159. The next prime is 1087231. The reversal of 1087220 is 227801.

It can be written as a sum of positive squares in 2 ways, for example, as 512656 + 574564 = 716^2 + 758^2 .

It is a Harshad number since it is a multiple of its sum of digits (20), and also a Moran number because the ratio is a prime number: 54361 = 1087220 / (1 + 0 + 8 + 7 + 2 + 2 + 0).

It is a junction number, because it is equal to n+sod(n) for n = 1087192 and 1087201.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27161 + ... + 27200.

It is an arithmetic number, because the mean of its divisors is an integer number (190267).

2^1087220 is an apocalyptic number.

1087220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1087220 is an abundant number, since it is smaller than the sum of its proper divisors (1195984).

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

1087220 is a wasteful number, since it uses less digits than its factorization.

1087220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54370 (or 54368 counting only the distinct ones).

The product of its (nonzero) digits is 224, while the sum is 20.

The square root of 1087220 is about 1042.6984223638. The cubic root of 1087220 is about 102.8266793235.

The spelling of 1087220 in words is "one million, eighty-seven thousand, two hundred twenty".