298721 has 4 divisors (see below), whose sum is σ = 305712. Its totient is φ = 291732.

The previous prime is 298709. The next prime is 298723. The reversal of 298721 is 127892.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-298721 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (298723) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3431 + ... + 3516.

It is an arithmetic number, because the mean of its divisors is an integer number (76428).

2²⁹⁸⁷²¹ is an apocalyptic number.

It is an amenable number.

298721 is a deficient number, since it is larger than the sum of its proper divisors (6991).

298721 is an equidigital number, since it uses as much as digits as its factorization.

298721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6990.

The product of its digits is 2016, while the sum is 29.

The square root of 298721 is about 546.5537485005. The cubic root of 298721 is about 66.8480256310.

The spelling of 298721 in words is "two hundred ninety-eight thousand, seven hundred twenty-one".