30018625 has 72 divisors (see below), whose sum is σ = 48817080. Its totient is φ = 18345600.

The previous prime is 30018619. The next prime is 30018647. The reversal of 30018625 is 52681003.

It is a happy number.

It can be written as a sum of positive squares in 12 ways, for example, as 28901376 + 1117249 = 5376^2 + 1057^2 .

It is a de Polignac number, because none of the positive numbers 2^k-30018625 is a prime.

It is a super-2 number, since 2×30018625² = 1802235693781250, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a self number, because there is not a number n which added to its sum of digits gives 30018625.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 1035111 + ... + 1035139.

It is an arithmetic number, because the mean of its divisors is an integer number (678015).

Almost surely, 2^30018625 is an apocalyptic number.

30018625 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

It is an amenable number.

30018625 is a deficient number, since it is larger than the sum of its proper divisors (18798455).

30018625 is a wasteful number, since it uses less digits than its factorization.

30018625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84 (or 54 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 30018625 is about 5478.9255333505. The cubic root of 30018625 is about 310.7875397434.

Adding to 30018625 its reverse (52681003), we get a palindrome (82699628).

The spelling of 30018625 in words is "thirty million, eighteen thousand, six hundred twenty-five".