30505399 has 2 divisors, whose sum is σ = 30505400. Its totient is φ = 30505398.

The previous prime is 30505309. The next prime is 30505421. The reversal of 30505399 is 99350503.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-30505399 is a prime.

It is equal to p_1887226 and since 30505399 and 1887226 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (30505309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15252699 + 15252700.

It is an arithmetic number, because the mean of its divisors is an integer number (15252700).

Almost surely, 2^30505399 is an apocalyptic number.

30505399 is a deficient number, since it is larger than the sum of its proper divisors (1).

30505399 is an equidigital number, since it uses as much as digits as its factorization.

30505399 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18225, while the sum is 34.

The square root of 30505399 is about 5523.1692894569. The cubic root of 30505399 is about 312.4584230553.

The spelling of 30505399 in words is "thirty million, five hundred five thousand, three hundred ninety-nine".