30072139 has 4 divisors (see below), whose sum is σ = 31042240. Its totient is φ = 29102040.

The previous prime is 30072137. The next prime is 30072143. The reversal of 30072139 is 93127003.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 30072139 - 2¹ = 30072137 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (30072137) 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, 485004 + ... + 485065.

It is an arithmetic number, because the mean of its divisors is an integer number (7760560).

Almost surely, 2^30072139 is an apocalyptic number.

30072139 is a deficient number, since it is larger than the sum of its proper divisors (970101).

30072139 is an equidigital number, since it uses as much as digits as its factorization.

30072139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 970100.

The product of its (nonzero) digits is 1134, while the sum is 25.

The square root of 30072139 is about 5483.8069805565. The cubic root of 30072139 is about 310.9721097255.

The spelling of 30072139 in words is "thirty million, seventy-two thousand, one hundred thirty-nine".