397481856 has 128 divisors (see below), whose sum is σ = 1092787200. Its totient is φ = 127948800.

The previous prime is 397481831. The next prime is 397481863. The reversal of 397481856 is 658184793.

It is a tau number, because it is divible by the number of its divisors (128).

It is a junction number, because it is equal to n+sod(n) for n = 397481799 and 397481808.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1662985 + ... + 1663223.

It is an arithmetic number, because the mean of its divisors is an integer number (8537400).

Almost surely, 2^397481856 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 397481856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (546393600).

397481856 is an abundant number, since it is smaller than the sum of its proper divisors (695305344).

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

397481856 is a wasteful number, since it uses less digits than its factorization.

397481856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 388 (or 376 counting only the distinct ones).

The product of its digits is 1451520, while the sum is 51.

The square root of 397481856 is about 19936.9470080050. The cubic root of 397481856 is about 735.2568901658.

The spelling of 397481856 in words is "three hundred ninety-seven million, four hundred eighty-one thousand, eight hundred fifty-six".