216863738 has 16 divisors (see below), whose sum is σ = 400364160. Its totient is φ = 85792176.

The previous prime is 216863737. The next prime is 216863741. The reversal of 216863738 is 837368612.

It is a Smith number, since the sum of its digits (44) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (216863737) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 595598 + ... + 595961.

It is an arithmetic number, because the mean of its divisors is an integer number (25022760).

Almost surely, 2^216863738 is an apocalyptic number.

216863738 is a deficient number, since it is larger than the sum of its proper divisors (183500422).

216863738 is a wasteful number, since it uses less digits than its factorization.

216863738 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1191581.

The product of its digits is 290304, while the sum is 44.

The square root of 216863738 is about 14726.2941027266. The cubic root of 216863738 is about 600.7986937495.

The spelling of 216863738 in words is "two hundred sixteen million, eight hundred sixty-three thousand, seven hundred thirty-eight".