397911528 has 240 divisors, whose sum is σ = 1349837280. Its totient is φ = 107705376.

The previous prime is 397911511. The next prime is 397911529. The reversal of 397911528 is 825119793.

397911528 is a `hidden beast` number, since 39 + 7 + 91 + 1 + 528 = 666.

It is not an unprimeable number, because it can be changed into a prime (397911529) by changing a digit.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 20942703 + ... + 20942721.

It is an arithmetic number, because the mean of its divisors is an integer number (5624322).

Almost surely, 2^397911528 is an apocalyptic number.

397911528 is a gapful number since it is divisible by the number (38) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 397911528, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (674918640).

397911528 is an abundant number, since it is smaller than the sum of its proper divisors (951925752).

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

397911528 is an frugal number, since it uses more digits than its factorization.

397911528 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78 (or 31 counting only the distinct ones).

The product of its digits is 136080, while the sum is 45.

The square root of 397911528 is about 19947.7198696994. The cubic root of 397911528 is about 735.5217286965.

It can be divided in two parts, 397 and 911528, that added together give a triangular number (911925 = T₁₃₅₀).

The spelling of 397911528 in words is "three hundred ninety-seven million, nine hundred eleven thousand, five hundred twenty-eight".