30666409 has 4 divisors (see below), whose sum is σ = 31655680. Its totient is φ = 29677140.

The previous prime is 30666397. The next prime is 30666431. The reversal of 30666409 is 90466603.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 90466603 = 331 ⋅273313.

It is a cyclic number.

It is not a de Polignac number, because 30666409 - 2⁹ = 30665897 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (30666479) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 494589 + ... + 494650.

It is an arithmetic number, because the mean of its divisors is an integer number (7913920).

Almost surely, 2^30666409 is an apocalyptic number.

It is an amenable number.

30666409 is a deficient number, since it is larger than the sum of its proper divisors (989271).

30666409 is an equidigital number, since it uses as much as digits as its factorization.

30666409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 989270.

The product of its (nonzero) digits is 23328, while the sum is 34.

The square root of 30666409 is about 5537.7259773304. The cubic root of 30666409 is about 313.0071857816.

The spelling of 30666409 in words is "thirty million, six hundred sixty-six thousand, four hundred nine".