1808630 has 16 divisors (see below), whose sum is σ = 3447360. Its totient is φ = 680832.

The previous prime is 1808627. The next prime is 1808669. The reversal of 1808630 is 368081.

It is a super-2 number, since 2×1808630² = 6542284953800, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1808630.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 5150 + ... + 5489.

It is an arithmetic number, because the mean of its divisors is an integer number (215460).

2^1808630 is an apocalyptic number.

1808630 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1808630 is a deficient number, since it is larger than the sum of its proper divisors (1638730).

1808630 is a wasteful number, since it uses less digits than its factorization.

1808630 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10663.

The product of its (nonzero) digits is 1152, while the sum is 26.

The square root of 1808630 is about 1344.8531518348. The cubic root of 1808630 is about 121.8381352452.

The spelling of 1808630 in words is "one million, eight hundred eight thousand, six hundred thirty".