398408993018 has 8 divisors (see below), whose sum is σ = 597618455412. Its totient is φ = 199202841216.

The previous prime is 398408992999. The next prime is 398408993039. The reversal of 398408993018 is 810399804893.

It can be written as a sum of positive squares in 2 ways, for example, as 398346535609 + 62457409 = 631147^2 + 7903^2 .

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 (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 501005 + ... + 1023632.

Almost surely, 2^398408993018 is an apocalyptic number.

398408993018 is a deficient number, since it is larger than the sum of its proper divisors (199209462394).

398408993018 is a wasteful number, since it uses less digits than its factorization.

398408993018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1655296.

The product of its (nonzero) digits is 13436928, while the sum is 62.

The spelling of 398408993018 in words is "three hundred ninety-eight billion, four hundred eight million, nine hundred ninety-three thousand, eighteen".