398165642 has 16 divisors (see below), whose sum is σ = 686761152. Its totient is φ = 169594560.

The previous prime is 398165641. The next prime is 398165671. The reversal of 398165642 is 246561893.

It is a Smith number, since the sum of its digits (44) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 398165593 and 398165602.

It is not an unprimeable number, because it can be changed into a prime (398165641) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 84959 + ... + 89522.

It is an arithmetic number, because the mean of its divisors is an integer number (42922572).

Almost surely, 2^398165642 is an apocalyptic number.

398165642 is a deficient number, since it is larger than the sum of its proper divisors (288595510).

398165642 is a wasteful number, since it uses less digits than its factorization.

398165642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 174653.

The product of its digits is 311040, while the sum is 44.

The square root of 398165642 is about 19954.0883530168. The cubic root of 398165642 is about 735.6782681801.

The spelling of 398165642 in words is "three hundred ninety-eight million, one hundred sixty-five thousand, six hundred forty-two".