397866672 has 180 divisors, whose sum is σ = 1309347000. Its totient is φ = 112444416.

The previous prime is 397866671. The next prime is 397866697. The reversal of 397866672 is 276668793.

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (397866671) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 797079 + ... + 797577.

It is an arithmetic number, because the mean of its divisors is an integer number (7274150).

Almost surely, 2^397866672 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 397866672, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (654673500).

397866672 is an abundant number, since it is smaller than the sum of its proper divisors (911480328).

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

397866672 is a wasteful number, since it uses less digits than its factorization.

397866672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 640 (or 624 counting only the distinct ones).

The product of its digits is 4572288, while the sum is 54.

The square root of 397866672 is about 19946.5954989818. The cubic root of 397866672 is about 735.4940895521.

The spelling of 397866672 in words is "three hundred ninety-seven million, eight hundred sixty-six thousand, six hundred seventy-two".