1089220 has 24 divisors (see below), whose sum is σ = 2495808. Its totient is φ = 396000.

The previous prime is 1089217. The next prime is 1089223. The reversal of 1089220 is 229801.

It is an interprime number because it is at equal distance from previous prime (1089217) and next prime (1089223).

It is a Harshad number since it is a multiple of its sum of digits (22).

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 1089191 and 1089200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1089223) 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, 2256 + ... + 2695.

It is an arithmetic number, because the mean of its divisors is an integer number (103992).

2^1089220 is an apocalyptic number.

1089220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1089220 is an abundant number, since it is smaller than the sum of its proper divisors (1406588).

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

1089220 is a wasteful number, since it uses less digits than its factorization.

1089220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4971 (or 4969 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 22.

The square root of 1089220 is about 1043.6570317877. The cubic root of 1089220 is about 102.8896924468.

The spelling of 1089220 in words is "one million, eighty-nine thousand, two hundred twenty".