397217965 has 4 divisors (see below), whose sum is σ = 476661564. Its totient is φ = 317774368.

The previous prime is 397217927. The next prime is 397217983. The reversal of 397217965 is 569712793.

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

It can be written as a sum of positive squares in 2 ways, for example, as 237498921 + 159719044 = 15411^2 + 12638^2 .

It is a cyclic number.

It is not a de Polignac number, because 397217965 - 2¹³ = 397209773 is a prime.

It is a super-2 number, since 2×397217965² = 315564223437482450, which contains 22 as substring.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39721792 + ... + 39721801.

It is an arithmetic number, because the mean of its divisors is an integer number (119165391).

Almost surely, 2^397217965 is an apocalyptic number.

It is an amenable number.

397217965 is a deficient number, since it is larger than the sum of its proper divisors (79443599).

397217965 is an equidigital number, since it uses as much as digits as its factorization.

397217965 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79443598.

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

The square root of 397217965 is about 19930.3277695075. The cubic root of 397217965 is about 735.0941400698.

The spelling of 397217965 in words is "three hundred ninety-seven million, two hundred seventeen thousand, nine hundred sixty-five".