1090900 has 18 divisors (see below), whose sum is σ = 2367470. Its totient is φ = 436320.

The previous prime is 1090897. The next prime is 1090909. The reversal of 1090900 is 90901.

It can be written as a sum of positive squares in 3 ways, for example, as 13456 + 1077444 = 116^2 + 1038^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1090909) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5355 + ... + 5554.

2^1090900 is an apocalyptic number.

1090900 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1090900 is an abundant number, since it is smaller than the sum of its proper divisors (1276570).

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

1090900 is a wasteful number, since it uses less digits than its factorization.

1090900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10923 (or 10916 counting only the distinct ones).

The product of its (nonzero) digits is 81, while the sum is 19.

The square root of 1090900 is about 1044.4615837837. The cubic root of 1090900 is about 102.9425638869.

Subtracting from 1090900 its reverse (90901), we obtain a palindrome (999999).

The spelling of 1090900 in words is "one million, ninety thousand, nine hundred".