299640 has 64 divisors (see below), whose sum is σ = 984960. Its totient is φ = 72320.

The previous prime is 299623. The next prime is 299653. The reversal of 299640 is 46992.

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

299640 is a Rhonda number in base 16.

It is a junction number, because it is equal to n+sod(n) for n = 299598 and 299607.

It is a congruent number.

It is an unprimeable number.

299640 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1207 + ... + 1433.

It is an arithmetic number, because the mean of its divisors is an integer number (15390).

2²⁹⁹⁶⁴⁰ is an apocalyptic number.

299640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 299640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (492480).

299640 is an abundant number, since it is smaller than the sum of its proper divisors (685320).

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

299640 is a wasteful number, since it uses less digits than its factorization.

299640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 252 (or 248 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 30.

The square root of 299640 is about 547.3938253214. The cubic root of 299640 is about 66.9165069721.

It can be divided in two parts, 299 and 640, that added together give a palindrome (939).

The spelling of 299640 in words is "two hundred ninety-nine thousand, six hundred forty".