986640 has 40 divisors (see below), whose sum is σ = 3059328. Its totient is φ = 263040.

The previous prime is 986633. The next prime is 986641. The reversal of 986640 is 46689.

It is a tau number, because it is divible by the number of its divisors (40).

It is a nialpdrome in base 10.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 986640.

It is not an unprimeable number, because it can be changed into a prime (986641) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1816 + ... + 2295.

2⁹⁸⁶⁶⁴⁰ is an apocalyptic number.

It is an amenable number.

986640 is an abundant number, since it is smaller than the sum of its proper divisors (2072688).

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

986640 is a wasteful number, since it uses less digits than its factorization.

986640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4127 (or 4121 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 33.

The square root of 986640 is about 993.2975385050. The cubic root of 986640 is about 99.5526685966.

The spelling of 986640 in words is "nine hundred eighty-six thousand, six hundred forty".