398138361 has 8 divisors (see below), whose sum is σ = 549156480. Its totient is φ = 256272912.

The previous prime is 398138359. The next prime is 398138381. The reversal of 398138361 is 163831893.

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

It is not a de Polignac number, because 398138361 - 2¹ = 398138359 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (398138311) 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, 2288065 + ... + 2288238.

It is an arithmetic number, because the mean of its divisors is an integer number (68644560).

Almost surely, 2^398138361 is an apocalyptic number.

It is an amenable number.

398138361 is a deficient number, since it is larger than the sum of its proper divisors (151018119).

398138361 is a wasteful number, since it uses less digits than its factorization.

398138361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4576335.

The product of its digits is 93312, while the sum is 42.

The square root of 398138361 is about 19953.4047470601. The cubic root of 398138361 is about 735.6614657114.

The spelling of 398138361 in words is "three hundred ninety-eight million, one hundred thirty-eight thousand, three hundred sixty-one".