16863408 has 60 divisors (see below), whose sum is σ = 47528208. Its totient is φ = 5581440.

The previous prime is 16863403. The next prime is 16863421. The reversal of 16863408 is 80436861.

It is a happy number.

16863408 is a `hidden beast` number, since 16 + 8 + 634 + 0 + 8 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (16863403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 25741 + ... + 26387.

Almost surely, 2^16863408 is an apocalyptic number.

16863408 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 16863408, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23764104).

16863408 is an abundant number, since it is smaller than the sum of its proper divisors (30664800).

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

16863408 is a wasteful number, since it uses less digits than its factorization.

16863408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 842 (or 833 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 36.

The square root of 16863408 is about 4106.5080055931. The cubic root of 16863408 is about 256.4376465742.

It can be divided in two parts, 16863 and 408, that added together give a palindrome (17271).

The spelling of 16863408 in words is "sixteen million, eight hundred sixty-three thousand, four hundred eight".