216397698 has 16 divisors (see below), whose sum is σ = 472140576. Its totient is φ = 65575040.

The previous prime is 216397697. The next prime is 216397703. The reversal of 216397698 is 896793612.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 216397698.

It is not an unprimeable number, because it can be changed into a prime (216397691) 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, 1639311 + ... + 1639442.

It is an arithmetic number, because the mean of its divisors is an integer number (29508786).

Almost surely, 2^216397698 is an apocalyptic number.

216397698 is an abundant number, since it is smaller than the sum of its proper divisors (255742878).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

216397698 is a wasteful number, since it uses less digits than its factorization.

216397698 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3278769.

The product of its digits is 979776, while the sum is 51.

The square root of 216397698 is about 14710.4621953221. The cubic root of 216397698 is about 600.3680131200.

The spelling of 216397698 in words is "two hundred sixteen million, three hundred ninety-seven thousand, six hundred ninety-eight".