18309379 has 8 divisors (see below), whose sum is σ = 20095488. Its totient is φ = 16543560.

The previous prime is 18309371. The next prime is 18309397. The reversal of 18309379 is 97390381.

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

It is not a de Polignac number, because 18309379 - 2³ = 18309371 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18309371) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3147 + ... + 6820.

It is an arithmetic number, because the mean of its divisors is an integer number (2511936).

Almost surely, 2^18309379 is an apocalyptic number.

18309379 is a deficient number, since it is larger than the sum of its proper divisors (1786109).

18309379 is a wasteful number, since it uses less digits than its factorization.

18309379 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10145.

The product of its (nonzero) digits is 40824, while the sum is 40.

The square root of 18309379 is about 4278.9460150836. The cubic root of 18309379 is about 263.5671040960.

The spelling of 18309379 in words is "eighteen million, three hundred nine thousand, three hundred seventy-nine".