216707997 has 8 divisors (see below), whose sum is σ = 315211680. Its totient is φ = 131338160.

The previous prime is 216707989. The next prime is 216707999. The reversal of 216707997 is 799707612.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 216707997 - 2³ = 216707989 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216707999) 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 7 ways as a sum of consecutive naturals, for example, 3283422 + ... + 3283487.

It is an arithmetic number, because the mean of its divisors is an integer number (39401460).

Almost surely, 2^216707997 is an apocalyptic number.

It is an amenable number.

216707997 is a deficient number, since it is larger than the sum of its proper divisors (98503683).

216707997 is a wasteful number, since it uses less digits than its factorization.

216707997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6566923.

The product of its (nonzero) digits is 333396, while the sum is 48.

The square root of 216707997 is about 14721.0052985521. The cubic root of 216707997 is about 600.6548378301.

The spelling of 216707997 in words is "two hundred sixteen million, seven hundred seven thousand, nine hundred ninety-seven".