18963856 has 10 divisors (see below), whose sum is σ = 36742502. Its totient is φ = 9481920.

The previous prime is 18963851. The next prime is 18963859. The reversal of 18963856 is 65836981.

It can be written as a sum of positive squares in only one way, i.e., 14899600 + 4064256 = 3860^2 + 2016^2 .

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

It is not an unprimeable number, because it can be changed into a prime (18963851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 592605 + ... + 592636.

Almost surely, 2^18963856 is an apocalyptic number.

18963856 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

18963856 is a deficient number, since it is larger than the sum of its proper divisors (17778646).

18963856 is a wasteful number, since it uses less digits than its factorization.

18963856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1185249 (or 1185243 counting only the distinct ones).

The product of its digits is 311040, while the sum is 46.

The square root of 18963856 is about 4354.7509687696. The cubic root of 18963856 is about 266.6708527121.

The spelling of 18963856 in words is "eighteen million, nine hundred sixty-three thousand, eight hundred fifty-six".