18309345 has 8 divisors (see below), whose sum is σ = 29294976. Its totient is φ = 9764976.

The previous prime is 18309341. The next prime is 18309371. The reversal of 18309345 is 54390381.

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

It is not a de Polignac number, because 18309345 - 2² = 18309341 is a prime.

It is a super-2 number, since 2×18309345² = 670464228658050, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18309341) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 610297 + ... + 610326.

It is an arithmetic number, because the mean of its divisors is an integer number (3661872).

Almost surely, 2^18309345 is an apocalyptic number.

18309345 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18309345 is a deficient number, since it is larger than the sum of its proper divisors (10985631).

18309345 is a wasteful number, since it uses less digits than its factorization.

18309345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1220631.

The product of its (nonzero) digits is 12960, while the sum is 33.

The square root of 18309345 is about 4278.9420421408. The cubic root of 18309345 is about 263.5669409503.

It can be divided in two parts, 1830 and 9345, that added together give a triangular number (11175 = T₁₄₉).

The spelling of 18309345 in words is "eighteen million, three hundred nine thousand, three hundred forty-five".