343621 has 12 divisors (see below), whose sum is σ = 386820. Its totient is φ = 304640.

The previous prime is 343601. The next prime is 343627. The reversal of 343621 is 126343.

343621 = 414² + 415².

It can be written as a sum of positive squares in 6 ways, for example, as 225 + 343396 = 15^2 + 586^2 .

It is not a de Polignac number, because 343621 - 2⁵ = 343589 is a prime.

It is a d-powerful number, because it can be written as 3³ + 4⁶ + 6⁷ + 3¹⁰ + 2⁹ + 1 .

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (343627) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8361 + ... + 8401.

It is an arithmetic number, because the mean of its divisors is an integer number (32235).

2³⁴³⁶²¹ is an apocalyptic number.

343621 is the 415-th centered square number.

It is an amenable number.

343621 is a deficient number, since it is larger than the sum of its proper divisors (43199).

343621 is a wasteful number, since it uses less digits than its factorization.

343621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104 (or 87 counting only the distinct ones).

The product of its digits is 432, while the sum is 19.

The square root of 343621 is about 586.1919480853. The cubic root of 343621 is about 70.0422194288.

Adding to 343621 its reverse (126343), we get a palindrome (469964).

It can be divided in two parts, 34 and 3621, that added together give a triangular number (3655 = T₈₅).

The spelling of 343621 in words is "three hundred forty-three thousand, six hundred twenty-one".