30621385 has 16 divisors (see below), whose sum is σ = 38128896. Its totient is φ = 23588928.

The previous prime is 30621373. The next prime is 30621389. The reversal of 30621385 is 58312603.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-30621385 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (30621389) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18252 + ... + 19858.

It is an arithmetic number, because the mean of its divisors is an integer number (2383056).

Almost surely, 2^30621385 is an apocalyptic number.

It is an amenable number.

30621385 is a deficient number, since it is larger than the sum of its proper divisors (7507511).

30621385 is a wasteful number, since it uses less digits than its factorization.

30621385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1752.

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 30621385 is about 5533.6592775486. The cubic root of 30621385 is about 312.8539264707.

Adding to 30621385 its reverse (58312603), we get a palindrome (88933988).

The spelling of 30621385 in words is "thirty million, six hundred twenty-one thousand, three hundred eighty-five".