398444728 has 16 divisors (see below), whose sum is σ = 815000760. Its totient is φ = 181111200.

The previous prime is 398444719. The next prime is 398444743. The reversal of 398444728 is 827444893.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2263803 + ... + 2263978.

Almost surely, 2^398444728 is an apocalyptic number.

It is an amenable number.

398444728 is an abundant number, since it is smaller than the sum of its proper divisors (416556032).

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

398444728 is a wasteful number, since it uses less digits than its factorization.

398444728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4527798 (or 4527794 counting only the distinct ones).

The product of its digits is 1548288, while the sum is 49.

The square root of 398444728 is about 19961.0803314851. The cubic root of 398444728 is about 735.8501142086.

The spelling of 398444728 in words is "three hundred ninety-eight million, four hundred forty-four thousand, seven hundred twenty-eight".