30021945 has 8 divisors (see below), whose sum is σ = 48035136. Its totient is φ = 16011696.

The previous prime is 30021941. The next prime is 30021977. The reversal of 30021945 is 54912003.

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

It is not a de Polignac number, because 30021945 - 2² = 30021941 is a prime.

It is a Smith number, since the sum of its digits (24) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (30021941) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1000717 + ... + 1000746.

It is an arithmetic number, because the mean of its divisors is an integer number (6004392).

Almost surely, 2^30021945 is an apocalyptic number.

It is an amenable number.

30021945 is a deficient number, since it is larger than the sum of its proper divisors (18013191).

30021945 is a wasteful number, since it uses less digits than its factorization.

30021945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2001471.

The product of its (nonzero) digits is 1080, while the sum is 24.

The square root of 30021945 is about 5479.2285040870. The cubic root of 30021945 is about 310.7989968149.

Adding to 30021945 its reverse (54912003), we get a palindrome (84933948).

The spelling of 30021945 in words is "thirty million, twenty-one thousand, nine hundred forty-five".