398317788 has 72 divisors (see below), whose sum is σ = 1125227376. Its totient is φ = 117753600.

The previous prime is 398317771. The next prime is 398317807. The reversal of 398317788 is 887713893.

398317788 is a `hidden beast` number, since 398 + 3 + 177 + 88 = 666.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3970 + ... + 28502.

It is an arithmetic number, because the mean of its divisors is an integer number (15628158).

Almost surely, 2^398317788 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 398317788, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (562613688).

398317788 is an abundant number, since it is smaller than the sum of its proper divisors (726909588).

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

398317788 is a wasteful number, since it uses less digits than its factorization.

398317788 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24595 (or 24590 counting only the distinct ones).

The product of its digits is 2032128, while the sum is 54.

The square root of 398317788 is about 19957.9003905722. The cubic root of 398317788 is about 735.7719613906.

The spelling of 398317788 in words is "three hundred ninety-eight million, three hundred seventeen thousand, seven hundred eighty-eight".