216397635 has 16 divisors (see below), whose sum is σ = 353604096. Its totient is φ = 112956128.

The previous prime is 216397633. The next prime is 216397637. The reversal of 216397635 is 536793612.

It is an interprime number because it is at equal distance from previous prime (216397633) and next prime (216397637).

It is a cyclic number.

It is not a de Polignac number, because 216397635 - 2¹ = 216397633 is a prime.

It is not an unprimeable number, because it can be changed into a prime (216397633) 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 15 ways as a sum of consecutive naturals, for example, 152769 + ... + 154178.

It is an arithmetic number, because the mean of its divisors is an integer number (22100256).

Almost surely, 2^216397635 is an apocalyptic number.

216397635 is a deficient number, since it is larger than the sum of its proper divisors (137206461).

216397635 is a wasteful number, since it uses less digits than its factorization.

216397635 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 307002.

The product of its digits is 204120, while the sum is 42.

The square root of 216397635 is about 14710.4600539888. The cubic root of 216397635 is about 600.3679548581.

The spelling of 216397635 in words is "two hundred sixteen million, three hundred ninety-seven thousand, six hundred thirty-five".