1282012820 has 48 divisors (see below), whose sum is σ = 2941880256. Its totient is φ = 465408000.

The previous prime is 1282012817. The next prime is 1282012861. The reversal of 1282012820 is 282102821.

It is a self number, because there is not a number n which added to its sum of digits gives 1282012820.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 136475 + ... + 145565.

It is an arithmetic number, because the mean of its divisors is an integer number (61289172).

Almost surely, 2^1282012820 is an apocalyptic number.

1282012820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1282012820 is an abundant number, since it is smaller than the sum of its proper divisors (1659867436).

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

1282012820 is a wasteful number, since it uses less digits than its factorization.

1282012820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9752 (or 9750 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 26.

The square root of 1282012820 is about 35805.2066046267. The cubic root of 1282012820 is about 1086.3358771258.

Subtracting from 1282012820 its reverse (282102821), we obtain a palindrome (999909999).

The spelling of 1282012820 in words is "one billion, two hundred eighty-two million, twelve thousand, eight hundred twenty".