30021985 has 32 divisors (see below), whose sum is σ = 42900480. Its totient is φ = 19740672.

The previous prime is 30021977. The next prime is 30022007. The reversal of 30021985 is 58912003.

It is not a de Polignac number, because 30021985 - 2³ = 30021977 is a prime.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 125496 + ... + 125734.

It is an arithmetic number, because the mean of its divisors is an integer number (1340640).

Almost surely, 2^30021985 is an apocalyptic number.

30021985 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

It is an amenable number.

30021985 is a deficient number, since it is larger than the sum of its proper divisors (12878495).

30021985 is a wasteful number, since it uses less digits than its factorization.

30021985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 385.

The product of its (nonzero) digits is 2160, while the sum is 28.

The square root of 30021985 is about 5479.2321542348. The cubic root of 30021985 is about 310.7991348467.

Adding to 30021985 its reverse (58912003), we get a palindrome (88933988).

It can be divided in two parts, 300219 and 85, that added together give a square (300304 = 548²).

The spelling of 30021985 in words is "thirty million, twenty-one thousand, nine hundred eighty-five".