343677821 has 4 divisors (see below), whose sum is σ = 345664572. Its totient is φ = 341691072.

The previous prime is 343677791. The next prime is 343677827. The reversal of 343677821 is 128776343.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 332880025 + 10797796 = 18245^2 + 3286^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-343677821 is a prime.

It is a super-2 number, since 2×343677821² = 236228889294616082, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (343677827) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 993116 + ... + 993461.

It is an arithmetic number, because the mean of its divisors is an integer number (86416143).

Almost surely, 2^343677821 is an apocalyptic number.

It is an amenable number.

343677821 is a deficient number, since it is larger than the sum of its proper divisors (1986751).

343677821 is a wasteful number, since it uses less digits than its factorization.

343677821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1986750.

The product of its digits is 169344, while the sum is 41.

The square root of 343677821 is about 18538.5495926731. The cubic root of 343677821 is about 700.4607993174.

The spelling of 343677821 in words is "three hundred forty-three million, six hundred seventy-seven thousand, eight hundred twenty-one".