15000018 has 64 divisors (see below), whose sum is σ = 35925120. Its totient is φ = 4121600.

The previous prime is 15000017. The next prime is 15000031. The reversal of 15000018 is 81000051.

It is a happy number.

15000018 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 14999970 and 15000006.

It is not an unprimeable number, because it can be changed into a prime (15000017) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 32308 + ... + 32768.

It is an arithmetic number, because the mean of its divisors is an integer number (561330).

Almost surely, 2^15000018 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 15000018, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17962560).

15000018 is an abundant number, since it is smaller than the sum of its proper divisors (20925102).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

15000018 is a wasteful number, since it uses less digits than its factorization.

15000018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 523.

The product of its (nonzero) digits is 40, while the sum is 15.

The square root of 15000018 is about 3872.9856699967. The cubic root of 15000018 is about 246.6213060815.

Adding to 15000018 its reverse (81000051), we get a palindrome (96000069).

The spelling of 15000018 in words is "fifteen million, eighteen", and thus it is an aban number and an uban number.