16000018 has 4 divisors (see below), whose sum is σ = 24000030. Its totient is φ = 8000008.

The previous prime is 15999989. The next prime is 16000057. The reversal of 16000018 is 81000061.

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

It can be written as a sum of positive squares in only one way, i.e., 13417569 + 2582449 = 3663^2 + 1607^2 .

16000018 is a modest number, since divided by 18 gives 16 as remainder.

It is a junction number, because it is equal to n+sod(n) for n = 15999965 and 16000010.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4000003 + ... + 4000006.

Almost surely, 2^16000018 is an apocalyptic number.

16000018 is a deficient number, since it is larger than the sum of its proper divisors (8000012).

16000018 is an equidigital number, since it uses as much as digits as its factorization.

16000018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8000011.

The product of its (nonzero) digits is 48, while the sum is 16.

The square root of 16000018 is about 4000.0022499994. The cubic root of 16000018 is about 251.9843044730.

Adding to 16000018 its reverse (81000061), we get a palindrome (97000079).

The spelling of 16000018 in words is "sixteen million, eighteen", and thus it is an aban number and an uban number.