18069999 has 4 divisors (see below), whose sum is σ = 24093336. Its totient is φ = 12046664.

The previous prime is 18069983. The next prime is 18070001. The reversal of 18069999 is 99996081.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 18069999 - 2⁴ = 18069983 is a prime.

18069999 is a modest number, since divided by 9999 gives 1806 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18069199) 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, 3011664 + ... + 3011669.

It is an arithmetic number, because the mean of its divisors is an integer number (6023334).

Almost surely, 2^18069999 is an apocalyptic number.

18069999 is a deficient number, since it is larger than the sum of its proper divisors (6023337).

18069999 is an equidigital number, since it uses as much as digits as its factorization.

18069999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6023336.

The product of its (nonzero) digits is 314928, while the sum is 51.

The square root of 18069999 is about 4250.8821437438. The cubic root of 18069999 is about 262.4134208803.

The spelling of 18069999 in words is "eighteen million, sixty-nine thousand, nine hundred ninety-nine".