30738821 has 4 divisors (see below), whose sum is σ = 31128000. Its totient is φ = 30349644.

The previous prime is 30738817. The next prime is 30738857. The reversal of 30738821 is 12883703.

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.

It is a cyclic number.

It is not a de Polignac number, because 30738821 - 2² = 30738817 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30738881) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 194471 + ... + 194628.

It is an arithmetic number, because the mean of its divisors is an integer number (7782000).

Almost surely, 2^30738821 is an apocalyptic number.

It is an amenable number.

30738821 is a deficient number, since it is larger than the sum of its proper divisors (389179).

30738821 is an equidigital number, since it uses as much as digits as its factorization.

30738821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 389178.

The product of its (nonzero) digits is 8064, while the sum is 32.

The square root of 30738821 is about 5544.2601850923. The cubic root of 30738821 is about 313.2533580658.

The spelling of 30738821 in words is "thirty million, seven hundred thirty-eight thousand, eight hundred twenty-one".