343624821 has 4 divisors (see below), whose sum is σ = 458166432. Its totient is φ = 229083212.

The previous prime is 343624783. The next prime is 343624837. The reversal of 343624821 is 128426343.

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, and also an emirpimes, since its reverse is a distinct semiprime: 128426343 = 3 ⋅42808781.

It is a cyclic number.

It is not a de Polignac number, because 343624821 - 2⁷ = 343624693 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (343624891) 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, 57270801 + ... + 57270806.

It is an arithmetic number, because the mean of its divisors is an integer number (114541608).

Almost surely, 2^343624821 is an apocalyptic number.

It is an amenable number.

343624821 is a deficient number, since it is larger than the sum of its proper divisors (114541611).

343624821 is a wasteful number, since it uses less digits than its factorization.

343624821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114541610.

The product of its digits is 27648, while the sum is 33.

The square root of 343624821 is about 18537.1200837671. The cubic root of 343624821 is about 700.4247904658.

The spelling of 343624821 in words is "three hundred forty-three million, six hundred twenty-four thousand, eight hundred twenty-one".