118640 has 20 divisors (see below), whose sum is σ = 276024. Its totient is φ = 47424.

The previous prime is 118633. The next prime is 118661. The reversal of 118640 is 46811.

118640 is nontrivially palindromic in base 6.

It is a tau number, because it is divible by the number of its divisors (20).

It is a Harshad number since it is a multiple of its sum of digits (20).

It is an Ulam number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 662 + ... + 821.

2¹¹⁸⁶⁴⁰ is an apocalyptic number.

118640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

118640 is an abundant number, since it is smaller than the sum of its proper divisors (157384).

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

118640 is a wasteful number, since it uses less digits than its factorization.

118640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1496 (or 1490 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 20.

The square root of 118640 is about 344.4415770490. The cubic root of 118640 is about 49.1371970612.

The spelling of 118640 in words is "one hundred eighteen thousand, six hundred forty".