30400621 has 2 divisors, whose sum is σ = 30400622. Its totient is φ = 30400620.

The previous prime is 30400609. The next prime is 30400637. The reversal of 30400621 is 12600403.

It is an a-pointer prime, because the next prime (30400637) can be obtained adding 30400621 to its sum of digits (16).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27678121 + 2722500 = 5261^2 + 1650^2 .

It is an emirp because it is prime and its reverse (12600403) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 30400621 - 2⁹ = 30400109 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 30400595 and 30400604.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (30400651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15200310 + 15200311.

It is an arithmetic number, because the mean of its divisors is an integer number (15200311).

Almost surely, 2^30400621 is an apocalyptic number.

It is an amenable number.

30400621 is a deficient number, since it is larger than the sum of its proper divisors (1).

30400621 is an equidigital number, since it uses as much as digits as its factorization.

30400621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 30400621 is about 5513.6758156424. The cubic root of 30400621 is about 312.1002752691.

The spelling of 30400621 in words is "thirty million, four hundred thousand, six hundred twenty-one".