346721 has 2 divisors, whose sum is σ = 346722. Its totient is φ = 346720.

The previous prime is 346711. The next prime is 346739. The reversal of 346721 is 127643.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 250000 + 96721 = 500^2 + 311^2 .

It is an emirp because it is prime and its reverse (127643) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 346721 - 2⁶ = 346657 is a prime.

It is a d-powerful number, because it can be written as 3⁶ + 4⁸ + 7 + 6⁷ + 2⁹ + 1 .

It is not a weakly prime, because it can be changed into another prime (346711) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 173360 + 173361.

It is an arithmetic number, because the mean of its divisors is an integer number (173361).

2³⁴⁶⁷²¹ is an apocalyptic number.

It is an amenable number.

346721 is a deficient number, since it is larger than the sum of its proper divisors (1).

346721 is an equidigital number, since it uses as much as digits as its factorization.

346721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1008, while the sum is 23.

The square root of 346721 is about 588.8301962366. The cubic root of 346721 is about 70.2522193800.

The spelling of 346721 in words is "three hundred forty-six thousand, seven hundred twenty-one".