398470928 has 10 divisors (see below), whose sum is σ = 772037454. Its totient is φ = 199235456.

The previous prime is 398470921. The next prime is 398470937. The reversal of 398470928 is 829074893.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 369869824 + 28601104 = 19232^2 + 5348^2 .

It is a super-2 number, since 2×398470928² = 317558160922362368, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (398470921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12452201 + ... + 12452232.

Almost surely, 2^398470928 is an apocalyptic number.

It is an amenable number.

398470928 is a deficient number, since it is larger than the sum of its proper divisors (373566526).

398470928 is a wasteful number, since it uses less digits than its factorization.

398470928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24904441 (or 24904435 counting only the distinct ones).

The product of its (nonzero) digits is 870912, while the sum is 50.

The square root of 398470928 is about 19961.7365978013. The cubic root of 398470928 is about 735.8662426275.

The spelling of 398470928 in words is "three hundred ninety-eight million, four hundred seventy thousand, nine hundred twenty-eight".