18038115 has 24 divisors (see below), whose sum is σ = 31410288. Its totient is φ = 9576000.

The previous prime is 18038107. The next prime is 18038117. The reversal of 18038115 is 51183081.

It is not a de Polignac number, because 18038115 - 2³ = 18038107 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18038117) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10497 + ... + 12093.

It is an arithmetic number, because the mean of its divisors is an integer number (1308762).

Almost surely, 2^18038115 is an apocalyptic number.

18038115 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

18038115 is a deficient number, since it is larger than the sum of its proper divisors (13372173).

18038115 is a wasteful number, since it uses less digits than its factorization.

18038115 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1859 (or 1856 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 27.

The square root of 18038115 is about 4247.1302075637. The cubic root of 18038115 is about 262.2589896722.

It can be divided in two parts, 1803 and 8115, that multiplied together give a triangular number (14631345 = T₅₄₀₉).

The spelling of 18038115 in words is "eighteen million, thirty-eight thousand, one hundred fifteen".