398520172 has 12 divisors (see below), whose sum is σ = 727732656. Its totient is φ = 190596560.

The previous prime is 398520169. The next prime is 398520179. The reversal of 398520172 is 271025893.

It is not an unprimeable number, because it can be changed into a prime (398520179) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2165779 + ... + 2165962.

It is an arithmetic number, because the mean of its divisors is an integer number (60644388).

Almost surely, 2^398520172 is an apocalyptic number.

It is an amenable number.

398520172 is a deficient number, since it is larger than the sum of its proper divisors (329212484).

398520172 is a wasteful number, since it uses less digits than its factorization.

398520172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4331768 (or 4331766 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 37.

The square root of 398520172 is about 19962.9700195136. The cubic root of 398520172 is about 735.8965547549.

The spelling of 398520172 in words is "three hundred ninety-eight million, five hundred twenty thousand, one hundred seventy-two".