299840 has 28 divisors (see below), whose sum is σ = 714756. Its totient is φ = 119808.

The previous prime is 299807. The next prime is 299843. The reversal of 299840 is 48992.

It can be written as a sum of positive squares in 2 ways, for example, as 53824 + 246016 = 232^2 + 496^2 .

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a junction number, because it is equal to n+sod(n) for n = 299797 and 299806.

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 299840.

It is not an unprimeable number, because it can be changed into a prime (299843) by changing a digit.

299840 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 3 ways as a sum of consecutive naturals, for example, 149 + ... + 788.

It is an arithmetic number, because the mean of its divisors is an integer number (25527).

2²⁹⁹⁸⁴⁰ is an apocalyptic number.

299840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

299840 is an abundant number, since it is smaller than the sum of its proper divisors (414916).

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

299840 is an equidigital number, since it uses as much as digits as its factorization.

299840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 954 (or 944 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 32.

The square root of 299840 is about 547.5764786767. The cubic root of 299840 is about 66.9313918616.

The spelling of 299840 in words is "two hundred ninety-nine thousand, eight hundred forty".