1812947442 has 32 divisors (see below), whose sum is σ = 3657700800. Its totient is φ = 599036928.

The previous prime is 1812947431. The next prime is 1812947447. The reversal of 1812947442 is 2447492181.

It is a junction number, because it is equal to n+sod(n) for n = 1812947394 and 1812947403.

It is not an unprimeable number, because it can be changed into a prime (1812947447) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 359434 + ... + 364442.

It is an arithmetic number, because the mean of its divisors is an integer number (114303150).

Almost surely, 2^1812947442 is an apocalyptic number.

1812947442 is an abundant number, since it is smaller than the sum of its proper divisors (1844753358).

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

1812947442 is a wasteful number, since it uses less digits than its factorization.

1812947442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5530.

The product of its digits is 129024, while the sum is 42.

The square root of 1812947442 is about 42578.7205303306. The cubic root of 1812947442 is about 1219.3500618604.

The spelling of 1812947442 in words is "one billion, eight hundred twelve million, nine hundred forty-seven thousand, four hundred forty-two".