398338666 has 8 divisors (see below), whose sum is σ = 651826944. Its totient is φ = 181063020.

The previous prime is 398338649. The next prime is 398338687. The reversal of 398338666 is 666833893.

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

It is an unprimeable number.

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, 9053130 + ... + 9053173.

It is an arithmetic number, because the mean of its divisors is an integer number (81478368).

Almost surely, 2^398338666 is an apocalyptic number.

398338666 is a deficient number, since it is larger than the sum of its proper divisors (253488278).

398338666 is a wasteful number, since it uses less digits than its factorization.

398338666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18106316.

The product of its digits is 3359232, while the sum is 52.

The square root of 398338666 is about 19958.4234347305. The cubic root of 398338666 is about 735.7848164351.

The spelling of 398338666 in words is "three hundred ninety-eight million, three hundred thirty-eight thousand, six hundred sixty-six".