1209985326 has 48 divisors (see below), whose sum is σ = 2871945648. Its totient is φ = 365126400.

The previous prime is 1209985321. The next prime is 1209985327. The reversal of 1209985326 is 6235899021.

1209985326 is a `hidden beast` number, since 1 + 20 + 9 + 98 + 532 + 6 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1209985321) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 35040 + ... + 60396.

It is an arithmetic number, because the mean of its divisors is an integer number (59832201).

Almost surely, 2^1209985326 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1209985326, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1435972824).

1209985326 is an abundant number, since it is smaller than the sum of its proper divisors (1661960322).

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

1209985326 is a wasteful number, since it uses less digits than its factorization.

1209985326 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25617 (or 25614 counting only the distinct ones).

The product of its (nonzero) digits is 233280, while the sum is 45.

The square root of 1209985326 is about 34784.8433372928. The cubic root of 1209985326 is about 1065.5979291329.

The spelling of 1209985326 in words is "one billion, two hundred nine million, nine hundred eighty-five thousand, three hundred twenty-six".