1087820 has 24 divisors (see below), whose sum is σ = 2310000. Its totient is φ = 430272.

The previous prime is 1087817. The next prime is 1087829. The reversal of 1087820 is 287801.

It is a self number, because there is not a number n which added to its sum of digits gives 1087820.

It is not an unprimeable number, because it can be changed into a prime (1087829) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1931 + ... + 2429.

It is an arithmetic number, because the mean of its divisors is an integer number (96250).

2^1087820 is an apocalyptic number.

1087820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1087820 is an abundant number, since it is smaller than the sum of its proper divisors (1222180).

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

1087820 is a wasteful number, since it uses less digits than its factorization.

1087820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 617 (or 615 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 26.

The square root of 1087820 is about 1042.9860977022. The cubic root of 1087820 is about 102.8455913688.

The spelling of 1087820 in words is "one million, eighty-seven thousand, eight hundred twenty".