398016940 has 36 divisors (see below), whose sum is σ = 882158256. Its totient is φ = 150824736.

The previous prime is 398016929. The next prime is 398016943. The reversal of 398016940 is 49610893.

It is a junction number, because it is equal to n+sod(n) for n = 398016893 and 398016902.

It is not an unprimeable number, because it can be changed into a prime (398016943) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 20344 + ... + 34783.

It is an arithmetic number, because the mean of its divisors is an integer number (24504396).

Almost surely, 2^398016940 is an apocalyptic number.

It is an amenable number.

398016940 is an abundant number, since it is smaller than the sum of its proper divisors (484141316).

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

398016940 is a wasteful number, since it uses less digits than its factorization.

398016940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55174 (or 55153 counting only the distinct ones).

The product of its (nonzero) digits is 46656, while the sum is 40.

The square root of 398016940 is about 19950.3619014794. The cubic root of 398016940 is about 735.5866727569.

The spelling of 398016940 in words is "three hundred ninety-eight million, sixteen thousand, nine hundred forty".