342721 has 4 divisors (see below), whose sum is σ = 346032. Its totient is φ = 339412.

The previous prime is 342697. The next prime is 342733. The reversal of 342721 is 127243.

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 342721 - 2⁷ = 342593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (342761) 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, 1495 + ... + 1708.

It is an arithmetic number, because the mean of its divisors is an integer number (86508).

2³⁴²⁷²¹ is an apocalyptic number.

It is an amenable number.

342721 is a deficient number, since it is larger than the sum of its proper divisors (3311).

342721 is a wasteful number, since it uses less digits than its factorization.

342721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3310.

The product of its digits is 336, while the sum is 19.

The square root of 342721 is about 585.4237781300. The cubic root of 342721 is about 69.9810152598.

Adding to 342721 its reverse (127243), we get a palindrome (469964).

It can be divided in two parts, 3 and 42721, that added together give a palindrome (42724).

The spelling of 342721 in words is "three hundred forty-two thousand, seven hundred twenty-one", and thus it is an iban number.