30442905 has 16 divisors (see below), whose sum is σ = 54120960. Its totient is φ = 16236144.

The previous prime is 30442901. The next prime is 30442913. The reversal of 30442905 is 50924403.

It is not a de Polignac number, because 30442905 - 2² = 30442901 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (30442901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 112617 + ... + 112886.

It is an arithmetic number, because the mean of its divisors is an integer number (3382560).

Almost surely, 2^30442905 is an apocalyptic number.

It is an amenable number.

30442905 is a deficient number, since it is larger than the sum of its proper divisors (23678055).

30442905 is a wasteful number, since it uses less digits than its factorization.

30442905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 225517 (or 225511 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

The square root of 30442905 is about 5517.5089487920. The cubic root of 30442905 is about 312.2449075591.

The spelling of 30442905 in words is "thirty million, four hundred forty-two thousand, nine hundred five".