16201818 has 24 divisors (see below), whose sum is σ = 35377056. Its totient is φ = 5358600.

The previous prime is 16201789. The next prime is 16201831. The reversal of 16201818 is 81810261.

16201818 is a modest number, since divided by 1818 gives 1620 as remainder.

It is a junction number, because it is equal to n+sod(n) for n = 16201791 and 16201800.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1078 + ... + 5793.

It is an arithmetic number, because the mean of its divisors is an integer number (1474044).

Almost surely, 2^16201818 is an apocalyptic number.

16201818 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

16201818 is an abundant number, since it is smaller than the sum of its proper divisors (19175238).

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

16201818 is a wasteful number, since it uses less digits than its factorization.

16201818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7010 (or 7007 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 27.

The square root of 16201818 is about 4025.1481960296. The cubic root of 16201818 is about 253.0392644253.

The spelling of 16201818 in words is "sixteen million, two hundred one thousand, eight hundred eighteen".