397478628 has 72 divisors (see below), whose sum is σ = 1024863840. Its totient is φ = 129866880.

The previous prime is 397478603. The next prime is 397478647. The reversal of 397478628 is 826874793.

397478628 is a `hidden beast` number, since 3 + 9 + 7 + 4 + 7 + 8 + 628 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 419251 + ... + 420197.

It is an arithmetic number, because the mean of its divisors is an integer number (14234220).

Almost surely, 2^397478628 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 397478628, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (512431920).

397478628 is an abundant number, since it is smaller than the sum of its proper divisors (627385212).

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

397478628 is a wasteful number, since it uses less digits than its factorization.

397478628 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1177 (or 1172 counting only the distinct ones).

The product of its digits is 4064256, while the sum is 54.

The square root of 397478628 is about 19936.8660526172. The cubic root of 397478628 is about 735.2548997893.

The spelling of 397478628 in words is "three hundred ninety-seven million, four hundred seventy-eight thousand, six hundred twenty-eight".