216207438 has 16 divisors (see below), whose sum is σ = 435069696. Its totient is φ = 71626680.

The previous prime is 216207427. The next prime is 216207443. The reversal of 216207438 is 834702612.

It is a junction number, because it is equal to n+sod(n) for n = 216207399 and 216207408.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 109558 + ... + 111513.

It is an arithmetic number, because the mean of its divisors is an integer number (27191856).

Almost surely, 2^216207438 is an apocalyptic number.

216207438 is an abundant number, since it is smaller than the sum of its proper divisors (218862258).

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

216207438 is a wasteful number, since it uses less digits than its factorization.

216207438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 221239.

The product of its (nonzero) digits is 16128, while the sum is 33.

The square root of 216207438 is about 14703.9939472240. The cubic root of 216207438 is about 600.1920107688.

The spelling of 216207438 in words is "two hundred sixteen million, two hundred seven thousand, four hundred thirty-eight".