1086820 has 36 divisors (see below), whose sum is σ = 2657340. Its totient is φ = 372288.

The previous prime is 1086817. The next prime is 1086859. The reversal of 1086820 is 286801.

It can be written as a sum of positive squares in 2 ways, for example, as 153664 + 933156 = 392^2 + 966^2 .

It is a hoax number, since the sum of its digits (25) coincides with the sum of the digits of its distinct prime factors.

It is an Ulam number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 426 + ... + 1534.

It is an arithmetic number, because the mean of its divisors is an integer number (73815).

2^1086820 is an apocalyptic number.

1086820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1086820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1328670).

1086820 is an abundant number, since it is smaller than the sum of its proper divisors (1570520).

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

1086820 is a wasteful number, since it uses less digits than its factorization.

1086820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1132 (or 1123 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 25.

The square root of 1086820 is about 1042.5065947034. The cubic root of 1086820 is about 102.8140674274.

The spelling of 1086820 in words is "one million, eighty-six thousand, eight hundred twenty".