1090890 has 96 divisors (see below), whose sum is σ = 3234816. Its totient is φ = 253440.

The previous prime is 1090889. The next prime is 1090891. The reversal of 1090890 is 980901.

It is an interprime number because it is at equal distance from previous prime (1090889) and next prime (1090891).

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (1090891) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 35175 + ... + 35205.

It is an arithmetic number, because the mean of its divisors is an integer number (33696).

2^1090890 is an apocalyptic number.

1090890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1090890, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1617408).

1090890 is an abundant number, since it is smaller than the sum of its proper divisors (2143926).

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

1090890 is a wasteful number, since it uses less digits than its factorization.

1090890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84 (or 81 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 27.

The square root of 1090890 is about 1044.4567966173. The cubic root of 1090890 is about 102.9422493366.

The spelling of 1090890 in words is "one million, ninety thousand, eight hundred ninety".