18480015 has 16 divisors (see below), whose sum is σ = 32853600. Its totient is φ = 9855936.

The previous prime is 18480001. The next prime is 18480029. The reversal of 18480015 is 51008481.

It is an interprime number because it is at equal distance from previous prime (18480001) and next prime (18480029).

It is not a de Polignac number, because 18480015 - 2⁷ = 18479887 is a prime.

It is a super-3 number, since 3×18480015³ (a number of 23 digits) contains 333 as substring.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 68310 + ... + 68579.

It is an arithmetic number, because the mean of its divisors is an integer number (2053350).

Almost surely, 2^18480015 is an apocalyptic number.

18480015 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

18480015 is a deficient number, since it is larger than the sum of its proper divisors (14373585).

18480015 is a wasteful number, since it uses less digits than its factorization.

18480015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136903 (or 136897 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 27.

The square root of 18480015 is about 4298.8387966985. The cubic root of 18480015 is about 264.3833531891.

Adding to 18480015 its reverse (51008481), we get a palindrome (69488496).

The spelling of 18480015 in words is "eighteen million, four hundred eighty thousand, fifteen".