30120639 has 8 divisors (see below), whose sum is σ = 41907072. Its totient is φ = 19207320.

The previous prime is 30120613. The next prime is 30120667. The reversal of 30120639 is 93602103.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 30120639 - 2⁸ = 30120383 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30120679) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 218197 + ... + 218334.

It is an arithmetic number, because the mean of its divisors is an integer number (5238384).

Almost surely, 2^30120639 is an apocalyptic number.

30120639 is a deficient number, since it is larger than the sum of its proper divisors (11786433).

30120639 is a wasteful number, since it uses less digits than its factorization.

30120639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 436557.

The product of its (nonzero) digits is 972, while the sum is 24.

The square root of 30120639 is about 5488.2273094324. The cubic root of 30120639 is about 311.1391973463.

The spelling of 30120639 in words is "thirty million, one hundred twenty thousand, six hundred thirty-nine".