345634821 has 12 divisors (see below), whose sum is σ = 570571872. Its totient is φ = 197505576.

The previous prime is 345634819. The next prime is 345634829. The reversal of 345634821 is 128436543.

345634821 is a `hidden beast` number, since 34 + 563 + 48 + 21 = 666.

It is not a de Polignac number, because 345634821 - 2¹ = 345634819 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (345634829) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2743071 + ... + 2743196.

It is an arithmetic number, because the mean of its divisors is an integer number (47547656).

Almost surely, 2^345634821 is an apocalyptic number.

It is an amenable number.

345634821 is a deficient number, since it is larger than the sum of its proper divisors (224937051).

345634821 is a wasteful number, since it uses less digits than its factorization.

345634821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5486280 (or 5486277 counting only the distinct ones).

The product of its digits is 69120, while the sum is 36.

The square root of 345634821 is about 18591.2565739920. The cubic root of 345634821 is about 701.7878251809.

The spelling of 345634821 in words is "three hundred forty-five million, six hundred thirty-four thousand, eight hundred twenty-one".