30640019 has 2 divisors, whose sum is σ = 30640020. Its totient is φ = 30640018.

The previous prime is 30639953. The next prime is 30640087. The reversal of 30640019 is 91004603.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-30640019 is a prime.

It is a super-2 number, since 2×30640019² = 1877621528640722, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 30639976 and 30640003.

It is not a weakly prime, because it can be changed into another prime (30640219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15320009 + 15320010.

It is an arithmetic number, because the mean of its divisors is an integer number (15320010).

Almost surely, 2^30640019 is an apocalyptic number.

30640019 is a deficient number, since it is larger than the sum of its proper divisors (1).

30640019 is an equidigital number, since it uses as much as digits as its factorization.

30640019 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 648, while the sum is 23.

The square root of 30640019 is about 5535.3427174837. The cubic root of 30640019 is about 312.9173738289.

The spelling of 30640019 in words is "thirty million, six hundred forty thousand, nineteen".