342781 has 4 divisors (see below), whose sum is σ = 347200. Its totient is φ = 338364.

The previous prime is 342761. The next prime is 342791. The reversal of 342781 is 187243.

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 342781 - 2⁷ = 342653 is a prime.

It is a super-2 number, since 2×342781² = 234997627922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (342761) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2091 + ... + 2248.

It is an arithmetic number, because the mean of its divisors is an integer number (86800).

2³⁴²⁷⁸¹ is an apocalyptic number.

It is an amenable number.

342781 is a deficient number, since it is larger than the sum of its proper divisors (4419).

342781 is an equidigital number, since it uses as much as digits as its factorization.

342781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4418.

The product of its digits is 1344, while the sum is 25.

The square root of 342781 is about 585.4750208164. The cubic root of 342781 is about 69.9850988690.

The spelling of 342781 in words is "three hundred forty-two thousand, seven hundred eighty-one".