396957217 has 8 divisors (see below), whose sum is σ = 398724480. Its totient is φ = 395194800.

The previous prime is 396957199. The next prime is 396957233. The reversal of 396957217 is 712759693.

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 396957217 - 2²⁷ = 262739489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (396957287) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 304467 + ... + 305767.

It is an arithmetic number, because the mean of its divisors is an integer number (49840560).

Almost surely, 2^396957217 is an apocalyptic number.

It is an amenable number.

396957217 is a deficient number, since it is larger than the sum of its proper divisors (1767263).

396957217 is a wasteful number, since it uses less digits than its factorization.

396957217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2423.

The product of its digits is 714420, while the sum is 49.

The square root of 396957217 is about 19923.7852076356. The cubic root of 396957217 is about 734.9332575489.

The spelling of 396957217 in words is "three hundred ninety-six million, nine hundred fifty-seven thousand, two hundred seventeen".