216386438 has 48 divisors (see below), whose sum is σ = 369490464. Its totient is φ = 94786560.

The previous prime is 216386407. The next prime is 216386447. The reversal of 216386438 is 834683612.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (41).

It is a junction number, because it is equal to n+sod(n) for n = 216386395 and 216386404.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 544856 + ... + 545252.

It is an arithmetic number, because the mean of its divisors is an integer number (7697718).

Almost surely, 2^216386438 is an apocalyptic number.

216386438 is a deficient number, since it is larger than the sum of its proper divisors (153104026).

216386438 is a wasteful number, since it uses less digits than its factorization.

216386438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 497 (or 480 counting only the distinct ones).

The product of its digits is 165888, while the sum is 41.

The square root of 216386438 is about 14710.0794695338. The cubic root of 216386438 is about 600.3575997913.

The spelling of 216386438 in words is "two hundred sixteen million, three hundred eighty-six thousand, four hundred thirty-eight".