1089820 has 24 divisors (see below), whose sum is σ = 2368800. Its totient is φ = 420672.

The previous prime is 1089799. The next prime is 1089841. The reversal of 1089820 is 289801.

It is an interprime number because it is at equal distance from previous prime (1089799) and next prime (1089841).

It is a congruent number.

It is an unprimeable number.

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, 360 + ... + 1519.

It is an arithmetic number, because the mean of its divisors is an integer number (98700).

2^1089820 is an apocalyptic number.

1089820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1089820 is an abundant number, since it is smaller than the sum of its proper divisors (1278980).

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

1089820 is a wasteful number, since it uses less digits than its factorization.

1089820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1917 (or 1915 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 28.

The square root of 1089820 is about 1043.9444429662. The cubic root of 1089820 is about 102.9085813409.

The spelling of 1089820 in words is "one million, eighty-nine thousand, eight hundred twenty".