1812429940 has 24 divisors (see below), whose sum is σ = 3808417032. Its totient is φ = 724531200.

The previous prime is 1812429901. The next prime is 1812429947. The reversal of 1812429940 is 499242181.

It can be written as a sum of positive squares in 4 ways, for example, as 333719824 + 1478710116 = 18268^2 + 38454^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1812429893 and 1812429902.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1812429947) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7240 + ... + 60640.

It is an arithmetic number, because the mean of its divisors is an integer number (158684043).

Almost surely, 2^1812429940 is an apocalyptic number.

1812429940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1812429940 is an abundant number, since it is smaller than the sum of its proper divisors (1995987092).

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

1812429940 is a wasteful number, since it uses less digits than its factorization.

1812429940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55107 (or 55105 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 40.

The square root of 1812429940 is about 42572.6430938931. The cubic root of 1812429940 is about 1219.2340305235.

The spelling of 1812429940 in words is "one billion, eight hundred twelve million, four hundred twenty-nine thousand, nine hundred forty".