397040 has 40 divisors (see below), whose sum is σ = 1056480. Its totient is φ = 135936.

The previous prime is 397037. The next prime is 397051. The reversal of 397040 is 40793.

It is a tau number, because it is divible by the number of its divisors (40).

It is a junction number, because it is equal to n+sod(n) for n = 396997 and 397015.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 397040.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 206 + ... + 914.

It is an arithmetic number, because the mean of its divisors is an integer number (26412).

2³⁹⁷⁰⁴⁰ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 397040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (528240).

397040 is an abundant number, since it is smaller than the sum of its proper divisors (659440).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

397040 is a wasteful number, since it uses less digits than its factorization.

397040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 729 (or 723 counting only the distinct ones).

The product of its (nonzero) digits is 756, while the sum is 23.

The square root of 397040 is about 630.1111013147. Note that the first 4 decimals coincide. The cubic root of 397040 is about 73.4984342610.

The spelling of 397040 in words is "three hundred ninety-seven thousand, forty".