1209810816 has 80 divisors (see below), whose sum is σ = 3600408240. Its totient is φ = 403266816.

The previous prime is 1209810809. The next prime is 1209810817. The reversal of 1209810816 is 6180189021.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1209810817) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 47976 + ... + 68711.

It is an arithmetic number, because the mean of its divisors is an integer number (45005103).

Almost surely, 2^1209810816 is an apocalyptic number.

1209810816 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1209810816 is an abundant number, since it is smaller than the sum of its proper divisors (2390597424).

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

1209810816 is an equidigital number, since it uses as much as digits as its factorization.

1209810816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 116713 (or 116692 counting only the distinct ones).

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

The square root of 1209810816 is about 34782.3348267479. The cubic root of 1209810816 is about 1065.5466980887.

Adding to 1209810816 its reverse (6180189021), we get a palindrome (7389999837).

The spelling of 1209810816 in words is "one billion, two hundred nine million, eight hundred ten thousand, eight hundred sixteen".