30400649 has 2 divisors, whose sum is σ = 30400650. Its totient is φ = 30400648.

The previous prime is 30400637. The next prime is 30400651. The reversal of 30400649 is 94600403.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 29626249 + 774400 = 5443^2 + 880^2 .

It is a cyclic number.

It is not a de Polignac number, because 30400649 - 2²⁰ = 29352073 is a prime.

Together with 30400651, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (30400609) 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 as a sum of consecutive naturals, namely, 15200324 + 15200325.

It is an arithmetic number, because the mean of its divisors is an integer number (15200325).

Almost surely, 2^30400649 is an apocalyptic number.

It is an amenable number.

30400649 is a deficient number, since it is larger than the sum of its proper divisors (1).

30400649 is an equidigital number, since it uses as much as digits as its factorization.

30400649 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2592, while the sum is 26.

The square root of 30400649 is about 5513.6783547828. The cubic root of 30400649 is about 312.1003710874.

The spelling of 30400649 in words is "thirty million, four hundred thousand, six hundred forty-nine".