397858720 has 96 divisors (see below), whose sum is σ = 1084406400. Its totient is φ = 135115776.

The previous prime is 397858717. The next prime is 397858723. The reversal of 397858720 is 27858793.

397858720 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (397858717) and next prime (397858723).

It is a super-2 number, since 2×397858720² = 316583122160076800, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (397858723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 120451 + ... + 123709.

It is an arithmetic number, because the mean of its divisors is an integer number (11295900).

Almost surely, 2^397858720 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 397858720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (542203200).

397858720 is an abundant number, since it is smaller than the sum of its proper divisors (686547680).

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

397858720 is a wasteful number, since it uses less digits than its factorization.

397858720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3390 (or 3382 counting only the distinct ones).

The product of its (nonzero) digits is 846720, while the sum is 49.

The square root of 397858720 is about 19946.3961657238. The cubic root of 397858720 is about 735.4891895120.

The spelling of 397858720 in words is "three hundred ninety-seven million, eight hundred fifty-eight thousand, seven hundred twenty".