298781 has 4 divisors (see below), whose sum is σ = 341472. Its totient is φ = 256092.

The previous prime is 298777. The next prime is 298799. The reversal of 298781 is 187892.

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 not a de Polignac number, because 298781 - 2² = 298777 is a prime.

It is a super-2 number, since 2×298781² = 178540171922, which contains 22 as substring.

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

It is a Duffinian number.

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 298781.

It is not an unprimeable number, because it can be changed into a prime (298681) 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, 21335 + ... + 21348.

It is an arithmetic number, because the mean of its divisors is an integer number (85368).

2²⁹⁸⁷⁸¹ is an apocalyptic number.

It is an amenable number.

298781 is a deficient number, since it is larger than the sum of its proper divisors (42691).

298781 is an equidigital number, since it uses as much as digits as its factorization.

298781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42690.

The product of its digits is 8064, while the sum is 35.

The square root of 298781 is about 546.6086351312. The cubic root of 298781 is about 66.8525009474.

Subtracting from 298781 its reverse (187892), we obtain a square (110889 = 333²).

The spelling of 298781 in words is "two hundred ninety-eight thousand, seven hundred eighty-one".