397117213 has 8 divisors (see below), whose sum is σ = 413432280. Its totient is φ = 380976960.

The previous prime is 397117183. The next prime is 397117243. The reversal of 397117213 is 312711793.

It is an interprime number because it is at equal distance from previous prime (397117183) and next prime (397117243).

It can be written as a sum of positive squares in 4 ways, for example, as 142969849 + 254147364 = 11957^2 + 15942^2 .

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 397117213 - 2¹³ = 397109021 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (397117243) 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, 39058 + ... + 48163.

It is an arithmetic number, because the mean of its divisors is an integer number (51679035).

Almost surely, 2^397117213 is an apocalyptic number.

It is an amenable number.

397117213 is a deficient number, since it is larger than the sum of its proper divisors (16315067).

397117213 is a wasteful number, since it uses less digits than its factorization.

397117213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87407.

The product of its digits is 7938, while the sum is 34.

The square root of 397117213 is about 19927.8000040145. The cubic root of 397117213 is about 735.0319840463.

The spelling of 397117213 in words is "three hundred ninety-seven million, one hundred seventeen thousand, two hundred thirteen".