398188388 has 24 divisors (see below), whose sum is σ = 751003008. Its totient is φ = 183639456.

The previous prime is 398188387. The next prime is 398188393. The reversal of 398188388 is 883881893.

It is not an unprimeable number, because it can be changed into a prime (398188387) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 102245 + ... + 106067.

It is an arithmetic number, because the mean of its divisors is an integer number (31291792).

Almost surely, 2^398188388 is an apocalyptic number.

It is an amenable number.

398188388 is a deficient number, since it is larger than the sum of its proper divisors (352814620).

398188388 is a wasteful number, since it uses less digits than its factorization.

398188388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5843 (or 5841 counting only the distinct ones).

The product of its digits is 2654208, while the sum is 56.

The square root of 398188388 is about 19954.6583032634. The cubic root of 398188388 is about 735.6922769388.

The spelling of 398188388 in words is "three hundred ninety-eight million, one hundred eighty-eight thousand, three hundred eighty-eight".