1812630 has 64 divisors (see below), whose sum is σ = 4727808. Its totient is φ = 443520.

The previous prime is 1812623. The next prime is 1812661. The reversal of 1812630 is 362181.

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 1812597 and 1812606.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 25495 + ... + 25565.

It is an arithmetic number, because the mean of its divisors is an integer number (73872).

2^1812630 is an apocalyptic number.

1812630 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1812630, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2363904).

1812630 is an abundant number, since it is smaller than the sum of its proper divisors (2915178).

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

1812630 is a wasteful number, since it uses less digits than its factorization.

1812630 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 141.

The product of its (nonzero) digits is 288, while the sum is 21.

The square root of 1812630 is about 1346.3394817059. The cubic root of 1812630 is about 121.9278889450.

It can be divided in two parts, 1812 and 630, that added together give a palindrome (2442).

The spelling of 1812630 in words is "one million, eight hundred twelve thousand, six hundred thirty".