1812630436 has 24 divisors (see below), whose sum is σ = 3214653624. Its totient is φ = 894220800.

The previous prime is 1812630371. The next prime is 1812630439. The reversal of 1812630436 is 6340362181.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 534996900 + 1277633536 = 23130^2 + 35744^2 .

It is not an unprimeable number, because it can be changed into a prime (1812630439) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 110716 + ... + 126028.

It is an arithmetic number, because the mean of its divisors is an integer number (133943901).

Almost surely, 2^1812630436 is an apocalyptic number.

It is an amenable number.

1812630436 is a deficient number, since it is larger than the sum of its proper divisors (1402023188).

1812630436 is a wasteful number, since it uses less digits than its factorization.

1812630436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15711 (or 15709 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 34.

The square root of 1812630436 is about 42574.9977803875. The cubic root of 1812630436 is about 1219.2789872098.

The spelling of 1812630436 in words is "one billion, eight hundred twelve million, six hundred thirty thousand, four hundred thirty-six".