1812015604 has 24 divisors (see below), whose sum is σ = 3632914880. Its totient is φ = 774674496.

The previous prime is 1812015593. The next prime is 1812015607. The reversal of 1812015604 is 4065102181.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1812015607) 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, 67662 + ... + 90565.

Almost surely, 2^1812015604 is an apocalyptic number.

1812015604 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

1812015604 is an abundant number, since it is smaller than the sum of its proper divisors (1820899276).

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

1812015604 is a wasteful number, since it uses less digits than its factorization.

1812015604 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 158647 (or 158645 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 28.

The square root of 1812015604 is about 42567.7765921595. The cubic root of 1812015604 is about 1219.1411145546.

Adding to 1812015604 its reverse (4065102181), we get a palindrome (5877117785).

The spelling of 1812015604 in words is "one billion, eight hundred twelve million, fifteen thousand, six hundred four".