1209818016 has 216 divisors, whose sum is σ = 3823337700. Its totient is φ = 362588160.

The previous prime is 1209818011. The next prime is 1209818033. The reversal of 1209818016 is 6108189021.

It can be written as a sum of positive squares in 2 ways, for example, as 1045875600 + 163942416 = 32340^2 + 12804^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (1209818011) 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, 5192236 + ... + 5192468.

Almost surely, 2^1209818016 is an apocalyptic number.

1209818016 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1209818016, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1911668850).

1209818016 is an abundant number, since it is smaller than the sum of its proper divisors (2613519684).

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

1209818016 is a wasteful number, since it uses less digits than its factorization.

1209818016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 420 (or 398 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 36.

The square root of 1209818016 is about 34782.4383274088. The cubic root of 1209818016 is about 1065.5488118960.

The spelling of 1209818016 in words is "one billion, two hundred nine million, eight hundred eighteen thousand, sixteen".