18000079 has 4 divisors (see below), whose sum is σ = 18012384. Its totient is φ = 17987776.

The previous prime is 18000067. The next prime is 18000089. The reversal of 18000079 is 97000081.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 97000081 = 109 ⋅889909.

It is a cyclic number.

It is not a de Polignac number, because 18000079 - 2¹³ = 17991887 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18000089) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3607 + ... + 7000.

It is an arithmetic number, because the mean of its divisors is an integer number (4503096).

Almost surely, 2^18000079 is an apocalyptic number.

18000079 is a deficient number, since it is larger than the sum of its proper divisors (12305).

18000079 is a wasteful number, since it uses less digits than its factorization.

18000079 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12304.

The product of its (nonzero) digits is 504, while the sum is 25.

The square root of 18000079 is about 4242.6499973484. The cubic root of 18000079 is about 262.0745228251.

The spelling of 18000079 in words is "eighteen million, seventy-nine", and thus it is an aban number and an uban number.