397966 has 8 divisors (see below), whose sum is σ = 600624. Its totient is φ = 197760.

The previous prime is 397963. The next prime is 397973. The reversal of 397966 is 669793.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a d-powerful number, because it can be written as 3 + 9² + 9² + 7⁶ + 6³ + 6⁷ .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (397963) 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, 130 + ... + 901.

It is an arithmetic number, because the mean of its divisors is an integer number (75078).

2³⁹⁷⁹⁶⁶ is an apocalyptic number.

397966 is a deficient number, since it is larger than the sum of its proper divisors (202658).

397966 is a wasteful number, since it uses less digits than its factorization.

397966 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1226.

The product of its digits is 61236, while the sum is 40.

The square root of 397966 is about 630.8454644364. The cubic root of 397966 is about 73.5555290187. Note that the first 4 decimals are identical.

It can be divided in two parts, 3 and 97966, that added together give a square (97969 = 313²).

The spelling of 397966 in words is "three hundred ninety-seven thousand, nine hundred sixty-six".