18090915 has 8 divisors (see below), whose sum is σ = 28945488. Its totient is φ = 9648480.

The previous prime is 18090901. The next prime is 18090923. The reversal of 18090915 is 51909081.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 18090915 - 2⁴ = 18090899 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 603016 + ... + 603045.

It is an arithmetic number, because the mean of its divisors is an integer number (3618186).

Almost surely, 2^18090915 is an apocalyptic number.

18090915 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

18090915 is a deficient number, since it is larger than the sum of its proper divisors (10854573).

18090915 is a wasteful number, since it uses less digits than its factorization.

18090915 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1206069.

The product of its (nonzero) digits is 3240, while the sum is 33.

The square root of 18090915 is about 4253.3416274736. The cubic root of 18090915 is about 262.5146295701.

Adding to 18090915 its reverse (51909081), we get a palindrome (69999996).

The spelling of 18090915 in words is "eighteen million, ninety thousand, nine hundred fifteen".