397767 has 4 divisors (see below), whose sum is σ = 530360. Its totient is φ = 265176.

The previous prime is 397763. The next prime is 397799. The reversal of 397767 is 767793.

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

It is not a de Polignac number, because 397767 - 2² = 397763 is a prime.

It is a d-powerful number, because it can be written as 3 + 9² + 7² + 7² + 6⁷ + 7⁶ .

It is a D-number.

It is a Duffinian number.

It is a plaindrome in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (397763) 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, 66292 + ... + 66297.

It is an arithmetic number, because the mean of its divisors is an integer number (132590).

2³⁹⁷⁷⁶⁷ is an apocalyptic number.

397767 is a deficient number, since it is larger than the sum of its proper divisors (132593).

397767 is a wasteful number, since it uses less digits than its factorization.

397767 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132592.

The product of its digits is 55566, while the sum is 39.

The square root of 397767 is about 630.6877198741. The cubic root of 397767 is about 73.5432666723.

The spelling of 397767 in words is "three hundred ninety-seven thousand, seven hundred sixty-seven".