216370639 has 4 divisors (see below), whose sum is σ = 216403600. Its totient is φ = 216337680.

The previous prime is 216370633. The next prime is 216370643. The reversal of 216370639 is 936073612.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 216370639 - 2¹¹ = 216368591 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 216370598 and 216370607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216370633) 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 3 ways as a sum of consecutive naturals, for example, 2907 + ... + 21004.

It is an arithmetic number, because the mean of its divisors is an integer number (54100900).

Almost surely, 2^216370639 is an apocalyptic number.

216370639 is a deficient number, since it is larger than the sum of its proper divisors (32961).

216370639 is an equidigital number, since it uses as much as digits as its factorization.

216370639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32960.

The product of its (nonzero) digits is 40824, while the sum is 37.

The square root of 216370639 is about 14709.5424469968. The cubic root of 216370639 is about 600.3429881538.

The spelling of 216370639 in words is "two hundred sixteen million, three hundred seventy thousand, six hundred thirty-nine".