983640 has 64 divisors (see below), whose sum is σ = 3375360. Its totient is φ = 224640.

The previous prime is 983617. The next prime is 983659. The reversal of 983640 is 46389.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 983598 and 983607.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 983640.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 255 + ... + 1425.

It is an arithmetic number, because the mean of its divisors is an integer number (52740).

2⁹⁸³⁶⁴⁰ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 983640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1687680).

983640 is an abundant number, since it is smaller than the sum of its proper divisors (2391720).

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

983640 is a wasteful number, since it uses less digits than its factorization.

983640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1192 (or 1188 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 30.

The square root of 983640 is about 991.7862672975. The cubic root of 983640 is about 99.4516654545.

The spelling of 983640 in words is "nine hundred eighty-three thousand, six hundred forty".