216397634 has 16 divisors (see below), whose sum is σ = 329800896. Its totient is φ = 106470000.

The previous prime is 216397633. The next prime is 216397637. The reversal of 216397634 is 436793612.

It is a junction number, because it is equal to n+sod(n) for n = 216397591 and 216397600.

It is not an unprimeable number, because it can be changed into a prime (216397633) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 95009 + ... + 97259.

It is an arithmetic number, because the mean of its divisors is an integer number (20612556).

Almost surely, 2^216397634 is an apocalyptic number.

216397634 is a deficient number, since it is larger than the sum of its proper divisors (113403262).

216397634 is a wasteful number, since it uses less digits than its factorization.

216397634 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3001.

The product of its digits is 163296, while the sum is 41.

The square root of 216397634 is about 14710.4600199994. The cubic root of 216397634 is about 600.3679539333.

The spelling of 216397634 in words is "two hundred sixteen million, three hundred ninety-seven thousand, six hundred thirty-four".