1812209789106 has 32 divisors (see below), whose sum is σ = 4027226258880. Its totient is φ = 604055920608.

The previous prime is 1812209789087. The next prime is 1812209789107. The reversal of 1812209789106 is 6019879022181.

It is a happy number.

It is a super-2 number, since 2×1812209789106² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (1812209789107) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2107885 + ... + 2840351.

It is an arithmetic number, because the mean of its divisors is an integer number (125850820590).

Almost surely, 2^{1812209789106} is an apocalyptic number.

1812209789106 is an abundant number, since it is smaller than the sum of its proper divisors (2215016469774).

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

1812209789106 is a wasteful number, since it uses less digits than its factorization.

1812209789106 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 778295 (or 778289 counting only the distinct ones).

The product of its (nonzero) digits is 870912, while the sum is 54.

The spelling of 1812209789106 in words is "one trillion, eight hundred twelve billion, two hundred nine million, seven hundred eighty-nine thousand, one hundred six".