397730 has 16 divisors (see below), whose sum is σ = 739584. Its totient is φ = 153840.

The previous prime is 397729. The next prime is 397751. The reversal of 397730 is 37793.

It is a Curzon number.

It is a nialpdrome in base 9.

It is a zygodrome in base 9.

It is a junction number, because it is equal to n+sod(n) for n = 397693 and 397702.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 332 + ... + 951.

It is an arithmetic number, because the mean of its divisors is an integer number (46224).

2³⁹⁷⁷³⁰ is an apocalyptic number.

397730 is a deficient number, since it is larger than the sum of its proper divisors (341854).

397730 is a wasteful number, since it uses less digits than its factorization.

397730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1321.

The product of its (nonzero) digits is 3969, while the sum is 29.

The square root of 397730 is about 630.6583861331. The cubic root of 397730 is about 73.5409862877.

The spelling of 397730 in words is "three hundred ninety-seven thousand, seven hundred thirty".