1983618 has 72 divisors (see below), whose sum is σ = 5415228. Its totient is φ = 520128.

The previous prime is 1983601. The next prime is 1983643. The reversal of 1983618 is 8163891.

It can be written as a sum of positive squares in 2 ways, for example, as 1979649 + 3969 = 1407^2 + 63^2 .

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 11380 + ... + 11552.

2^1983618 is an apocalyptic number.

1983618 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 1983618, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2707614).

1983618 is an abundant number, since it is smaller than the sum of its proper divisors (3431610).

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

1983618 is a wasteful number, since it uses less digits than its factorization.

1983618 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 208 (or 198 counting only the distinct ones).

The product of its digits is 10368, while the sum is 36.

The square root of 1983618 is about 1408.4097415170. The cubic root of 1983618 is about 125.6471610121.

It can be divided in two parts, 1983 and 618, that added together give a square (2601 = 51²).

The spelling of 1983618 in words is "one million, nine hundred eighty-three thousand, six hundred eighteen".