397906884 has 96 divisors (see below), whose sum is σ = 1055040000. Its totient is φ = 129662208.

The previous prime is 397906871. The next prime is 397906889. The reversal of 397906884 is 488609793.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a self number, because there is not a number n which added to its sum of digits gives 397906884.

It is not an unprimeable number, because it can be changed into a prime (397906889) 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 31 ways as a sum of consecutive naturals, for example, 1271112 + ... + 1271424.

It is an arithmetic number, because the mean of its divisors is an integer number (10990000).

Almost surely, 2^397906884 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 397906884, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (527520000).

397906884 is an abundant number, since it is smaller than the sum of its proper divisors (657133116).

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

397906884 is a wasteful number, since it uses less digits than its factorization.

397906884 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 554 (or 546 counting only the distinct ones).

The product of its (nonzero) digits is 2612736, while the sum is 54.

The square root of 397906884 is about 19947.6034650782. The cubic root of 397906884 is about 735.5188672763.

The spelling of 397906884 in words is "three hundred ninety-seven million, nine hundred six thousand, eight hundred eighty-four".