30821643 has 12 divisors (see below), whose sum is σ = 44687968. Its totient is φ = 20470320.

The previous prime is 30821641. The next prime is 30821647. The reversal of 30821643 is 34612803.

It is a happy number.

It is not a de Polignac number, because 30821643 - 2¹ = 30821641 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (30821641) 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, 3880 + ... + 8757.

Almost surely, 2^30821643 is an apocalyptic number.

30821643 is a deficient number, since it is larger than the sum of its proper divisors (13866325).

30821643 is a wasteful number, since it uses less digits than its factorization.

30821643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12914 (or 12911 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 30821643 is about 5551.7243267295. The cubic root of 30821643 is about 313.5344467388.

The spelling of 30821643 in words is "thirty million, eight hundred twenty-one thousand, six hundred forty-three".