1630818 has 54 divisors (see below), whose sum is σ = 4208139. Its totient is φ = 455112.

The previous prime is 1630813. The next prime is 1630829. The reversal of 1630818 is 8180361.

It can be written as a sum of positive squares in only one way, i.e., 815409 + 815409 = 903^2 + 903^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=903.

It is a junction number, because it is equal to n+sod(n) for n = 1630791 and 1630800.

It is not an unprimeable number, because it can be changed into a prime (1630813) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 37905 + ... + 37947.

2^1630818 is an apocalyptic number.

1630818 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1630818

1630818 is an abundant number, since it is smaller than the sum of its proper divisors (2577321).

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

1630818 is a wasteful number, since it uses less digits than its factorization.

1630818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108 (or 55 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 27.

The square root of 1630818 is about 1277.0348468229. The cubic root of 1630818 is about 117.7068756304.

Multiplying 1630818 by its product of nonzero digits (1152), we get a square (1878702336 = 43344²).

The spelling of 1630818 in words is "one million, six hundred thirty thousand, eight hundred eighteen".