1284181812 has 18 divisors (see below), whose sum is σ = 3246126338. Its totient is φ = 428060592.

The previous prime is 1284181781. The next prime is 1284181813. The reversal of 1284181812 is 2181814821.

It can be written as a sum of positive squares in only one way, i.e., 1191906576 + 92275236 = 34524^2 + 9606^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 35671717 = 1284181812 / (1 + 2 + 8 + 4 + 1 + 8 + 1 + 8 + 1 + 2).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1284181813) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 17835823 + ... + 17835894.

Almost surely, 2^1284181812 is an apocalyptic number.

1284181812 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1284181812 is an abundant number, since it is smaller than the sum of its proper divisors (1961944526).

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

1284181812 is a wasteful number, since it uses less digits than its factorization.

1284181812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35671727 (or 35671722 counting only the distinct ones).

The product of its digits is 8192, while the sum is 36.

The square root of 1284181812 is about 35835.4825836070. The cubic root of 1284181812 is about 1086.9481763209.

The spelling of 1284181812 in words is "one billion, two hundred eighty-four million, one hundred eighty-one thousand, eight hundred twelve".