12609090 has 72 divisors (see below), whose sum is σ = 35542260. Its totient is φ = 3100032.

The previous prime is 12609073. The next prime is 12609097. The reversal of 12609090 is 9090621.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 1580049 + 11029041 = 1257^2 + 3321^2 .

12609090 is a modest number, since divided by 9090 gives 1260 as remainder.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (12609097) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 14796 + ... + 15624.

Almost surely, 2^12609090 is an apocalyptic number.

12609090 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 12609090, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17771130).

12609090 is an abundant number, since it is smaller than the sum of its proper divisors (22933170).

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

12609090 is a wasteful number, since it uses less digits than its factorization.

12609090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 868 (or 852 counting only the distinct ones).

The product of its (nonzero) digits is 972, while the sum is 27.

The square root of 12609090 is about 3550.9280477081. The cubic root of 12609090 is about 232.7526217043.

The spelling of 12609090 in words is "twelve million, six hundred nine thousand, ninety".