390018 has 8 divisors (see below), whose sum is σ = 780048. Its totient is φ = 130004.

The previous prime is 390001. The next prime is 390043. The reversal of 390018 is 810093.

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

390018 is an admirable number.

It is a super-2 number, since 2×390018² = 304228080648, which contains 22 as substring.

It is a Curzon number.

It is a zygodrome in base 5.

It is a junction number, because it is equal to n+sod(n) for n = 389976 and 390003.

It is an unprimeable number.

390018 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32496 + ... + 32507.

It is an arithmetic number, because the mean of its divisors is an integer number (97506).

2³⁹⁰⁰¹⁸ is an apocalyptic number.

390018 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

390018 is a wasteful number, since it uses less digits than its factorization.

390018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65008.

The product of its (nonzero) digits is 216, while the sum is 21.

The square root of 390018 is about 624.5142112074. The cubic root of 390018 is about 73.0625597454.

The spelling of 390018 in words is "three hundred ninety thousand, eighteen".