16864155 has 96 divisors (see below), whose sum is σ = 37859328. Its totient is φ = 6739200.

The previous prime is 16864139. The next prime is 16864157. The reversal of 16864155 is 55146861.

16864155 is a `hidden beast` number, since 1 + 6 + 8 + 641 + 5 + 5 = 666.

It is not a de Polignac number, because 16864155 - 2⁴ = 16864139 is a prime.

It is not an unprimeable number, because it can be changed into a prime (16864157) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 107337 + ... + 107493.

It is an arithmetic number, because the mean of its divisors is an integer number (394368).

Almost surely, 2^16864155 is an apocalyptic number.

16864155 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

16864155 is an abundant number, since it is smaller than the sum of its proper divisors (20995173).

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

16864155 is a wasteful number, since it uses less digits than its factorization.

16864155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 217 (or 214 counting only the distinct ones).

The product of its digits is 28800, while the sum is 36.

The square root of 16864155 is about 4106.5989577752. The cubic root of 16864155 is about 256.4414329993.

The spelling of 16864155 in words is "sixteen million, eight hundred sixty-four thousand, one hundred fifty-five".