397105997 has 4 divisors (see below), whose sum is σ = 400817376. Its totient is φ = 393394620.

The previous prime is 397105987. The next prime is 397106011. The reversal of 397105997 is 799501793.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 799501793 = 367 ⋅2178479.

It is a cyclic number.

It is not a de Polignac number, because 397105997 - 2²⁰ = 396057421 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 (397105957) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1855529 + ... + 1855742.

It is an arithmetic number, because the mean of its divisors is an integer number (100204344).

Almost surely, 2^397105997 is an apocalyptic number.

It is an amenable number.

397105997 is a deficient number, since it is larger than the sum of its proper divisors (3711379).

397105997 is a wasteful number, since it uses less digits than its factorization.

397105997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3711378.

The product of its (nonzero) digits is 535815, while the sum is 50.

The square root of 397105997 is about 19927.5185861160. The cubic root of 397105997 is about 735.0250640102.

The spelling of 397105997 in words is "three hundred ninety-seven million, one hundred five thousand, nine hundred ninety-seven".