1820810012 has 96 divisors (see below), whose sum is σ = 3822336000. Its totient is φ = 758407104.

The previous prime is 1820809967. The next prime is 1820810039. The reversal of 1820810012 is 2100180281.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 1820810012.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11597438 + ... + 11597594.

It is an arithmetic number, because the mean of its divisors is an integer number (39816000).

Almost surely, 2^1820810012 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1820810012, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1911168000).

1820810012 is an abundant number, since it is smaller than the sum of its proper divisors (2001525988).

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

1820810012 is a wasteful number, since it uses less digits than its factorization.

1820810012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 368 (or 352 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 23.

The square root of 1820810012 is about 42670.9504464103. The cubic root of 1820810012 is about 1221.1102524174.

Adding to 1820810012 its reverse (2100180281), we get a palindrome (3920990293).

The spelling of 1820810012 in words is "one billion, eight hundred twenty million, eight hundred ten thousand, twelve".