30009979 has 2 divisors, whose sum is σ = 30009980. Its totient is φ = 30009978.

The previous prime is 30009919. The next prime is 30010021. The reversal of 30009979 is 97990003.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 30009979 - 2⁷ = 30009851 is a prime.

It is not a weakly prime, because it can be changed into another prime (30009919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15004989 + 15004990.

It is an arithmetic number, because the mean of its divisors is an integer number (15004990).

Almost surely, 2^30009979 is an apocalyptic number.

30009979 is a deficient number, since it is larger than the sum of its proper divisors (1).

30009979 is an equidigital number, since it uses as much as digits as its factorization.

30009979 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15309, while the sum is 37.

The square root of 30009979 is about 5478.1364532111. The cubic root of 30009979 is about 310.7576990796.

The spelling of 30009979 in words is "thirty million, nine thousand, nine hundred seventy-nine".