16321818 has 8 divisors (see below), whose sum is σ = 32643648. Its totient is φ = 5440604.

The previous prime is 16321807. The next prime is 16321843. The reversal of 16321818 is 81812361.

16321818 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

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

16321818 is an admirable number.

It is an alternating number because its digits alternate between odd and even.

16321818 is a modest number, since divided by 1818 gives 1632 as remainder.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1360146 + ... + 1360157.

It is an arithmetic number, because the mean of its divisors is an integer number (4080456).

Almost surely, 2^16321818 is an apocalyptic number.

16321818 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.

16321818 is a wasteful number, since it uses less digits than its factorization.

16321818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2720308.

The product of its digits is 2304, while the sum is 30.

The square root of 16321818 is about 4040.0269801079. The cubic root of 16321818 is about 253.6624465995.

The spelling of 16321818 in words is "sixteen million, three hundred twenty-one thousand, eight hundred eighteen".