397223680 has 144 divisors (see below), whose sum is σ = 1113767424. Its totient is φ = 132894720.

The previous prime is 397223647. The next prime is 397223693. The reversal of 397223680 is 86322793.

397223680 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (40).

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, 384765 + ... + 385795.

It is an arithmetic number, because the mean of its divisors is an integer number (7734496).

Almost surely, 2^397223680 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 397223680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (556883712).

397223680 is an abundant number, since it is smaller than the sum of its proper divisors (716543744).

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

397223680 is a wasteful number, since it uses less digits than its factorization.

397223680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1102 (or 1088 counting only the distinct ones).

The product of its (nonzero) digits is 108864, while the sum is 40.

The square root of 397223680 is about 19930.4711434527. The cubic root of 397223680 is about 735.0976654583.

The spelling of 397223680 in words is "three hundred ninety-seven million, two hundred twenty-three thousand, six hundred eighty".