344642621 has 4 divisors (see below), whose sum is σ = 348515100. Its totient is φ = 340770144.

The previous prime is 344642611. The next prime is 344642647. The reversal of 344642621 is 126246443.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 126246443 = 5419 ⋅23297.

It can be written as a sum of positive squares in 2 ways, for example, as 187416100 + 157226521 = 13690^2 + 12539^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-344642621 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (344642611) 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, 1936106 + ... + 1936283.

It is an arithmetic number, because the mean of its divisors is an integer number (87128775).

Almost surely, 2^344642621 is an apocalyptic number.

It is an amenable number.

344642621 is a deficient number, since it is larger than the sum of its proper divisors (3872479).

344642621 is an equidigital number, since it uses as much as digits as its factorization.

344642621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3872478.

The product of its digits is 27648, while the sum is 32.

The square root of 344642621 is about 18564.5528090498. The cubic root of 344642621 is about 701.1156501994.

The spelling of 344642621 in words is "three hundred forty-four million, six hundred forty-two thousand, six hundred twenty-one".