30439621 has 2 divisors, whose sum is σ = 30439622. Its totient is φ = 30439620.

The previous prime is 30439609. The next prime is 30439663. The reversal of 30439621 is 12693403.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21288996 + 9150625 = 4614^2 + 3025^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-30439621 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 30439621.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (30479621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15219810 + 15219811.

It is an arithmetic number, because the mean of its divisors is an integer number (15219811).

Almost surely, 2^30439621 is an apocalyptic number.

It is an amenable number.

30439621 is a deficient number, since it is larger than the sum of its proper divisors (1).

30439621 is an equidigital number, since it uses as much as digits as its factorization.

30439621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3888, while the sum is 28.

The square root of 30439621 is about 5517.2113426984. The cubic root of 30439621 is about 312.2336794459.

The spelling of 30439621 in words is "thirty million, four hundred thirty-nine thousand, six hundred twenty-one".