398172065 has 8 divisors (see below), whose sum is σ = 478068480. Its totient is φ = 318362992.

The previous prime is 398172053. The next prime is 398172083. The reversal of 398172065 is 560271893.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 398172065 - 2¹⁰ = 398171041 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11345 + ... + 30414.

It is an arithmetic number, because the mean of its divisors is an integer number (59758560).

Almost surely, 2^398172065 is an apocalyptic number.

It is an amenable number.

398172065 is a deficient number, since it is larger than the sum of its proper divisors (79896415).

398172065 is a wasteful number, since it uses less digits than its factorization.

398172065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43671.

The product of its (nonzero) digits is 90720, while the sum is 41.

The square root of 398172065 is about 19954.2492968290. The cubic root of 398172065 is about 735.6822240179.

The spelling of 398172065 in words is "three hundred ninety-eight million, one hundred seventy-two thousand, sixty-five".