1815789612 has 96 divisors (see below), whose sum is σ = 5256036352. Its totient is φ = 475082496.

The previous prime is 1815789607. The next prime is 1815789617. The reversal of 1815789612 is 2169875181.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1815789607) and next prime (1815789617).

It is a super-2 number, since 2×1815789612² = 6594183830094221088, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1815789617) 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 31 ways as a sum of consecutive naturals, for example, 132138 + ... + 145230.

Almost surely, 2^1815789612 is an apocalyptic number.

1815789612 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1815789612, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2628018176).

1815789612 is an abundant number, since it is smaller than the sum of its proper divisors (3440246740).

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

1815789612 is a wasteful number, since it uses less digits than its factorization.

1815789612 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13247 (or 13245 counting only the distinct ones).

The product of its digits is 241920, while the sum is 48.

The square root of 1815789612 is about 42612.0829343040. The cubic root of 1815789612 is about 1219.9869236259.

The spelling of 1815789612 in words is "one billion, eight hundred fifteen million, seven hundred eighty-nine thousand, six hundred twelve".