1812830386 has 4 divisors (see below), whose sum is σ = 2719245582. Its totient is φ = 906415192.

The previous prime is 1812830359. The next prime is 1812830419. The reversal of 1812830386 is 6830382181.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 1806675025 + 6155361 = 42505^2 + 2481^2 .

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 453207595 + ... + 453207598.

Almost surely, 2^1812830386 is an apocalyptic number.

1812830386 is a deficient number, since it is larger than the sum of its proper divisors (906415196).

1812830386 is an equidigital number, since it uses as much as digits as its factorization.

1812830386 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 906415195.

The product of its (nonzero) digits is 55296, while the sum is 40.

The square root of 1812830386 is about 42577.3459247990. The cubic root of 1812830386 is about 1219.3238181665.

The spelling of 1812830386 in words is "one billion, eight hundred twelve million, eight hundred thirty thousand, three hundred eighty-six".