1089870 has 32 divisors (see below), whose sum is σ = 2770848. Its totient is φ = 273408.

The previous prime is 1089863. The next prime is 1089877. The reversal of 1089870 is 789801.

It is an interprime number because it is at equal distance from previous prime (1089863) and next prime (1089877).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1089877) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 559 + ... + 1578.

It is an arithmetic number, because the mean of its divisors is an integer number (86589).

2^1089870 is an apocalyptic number.

1089870 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1089870 is an abundant number, since it is smaller than the sum of its proper divisors (1680978).

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

1089870 is a wasteful number, since it uses less digits than its factorization.

1089870 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2164.

The product of its (nonzero) digits is 4032, while the sum is 33.

The square root of 1089870 is about 1043.9683903261. The cubic root of 1089870 is about 102.9101551024.

The spelling of 1089870 in words is "one million, eighty-nine thousand, eight hundred seventy".