11909090 has 16 divisors (see below), whose sum is σ = 21678840. Its totient is φ = 4709760.

The previous prime is 11909083. The next prime is 11909099. The reversal of 11909090 is 9090911.

It can be written as a sum of positive squares in 4 ways, for example, as 5257849 + 6651241 = 2293^2 + 2579^2 .

11909090 is a modest number, since divided by 9090 gives 1190 as remainder.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (11909099) 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, 5801 + ... + 7580.

Almost surely, 2^11909090 is an apocalyptic number.

11909090 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

11909090 is a deficient number, since it is larger than the sum of its proper divisors (9769750).

11909090 is a wasteful number, since it uses less digits than its factorization.

11909090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13477.

The product of its (nonzero) digits is 729, while the sum is 29.

The square root of 11909090 is about 3450.9549403028. The cubic root of 11909090 is about 228.3632380721.

It can be divided in two parts, 1 and 1909090, that added together give a palindrome (1909091).

The spelling of 11909090 in words is "eleven million, nine hundred nine thousand, ninety".