398840986 has 8 divisors (see below), whose sum is σ = 598669344. Its totient is φ = 199284540.

The previous prime is 398840977. The next prime is 398840987. The reversal of 398840986 is 689048893.

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

It is a super-2 number, since 2×398840986² = 318148264226904392, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (398840987) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 64270 + ... + 70201.

It is an arithmetic number, because the mean of its divisors is an integer number (74833668).

Almost surely, 2^398840986 is an apocalyptic number.

398840986 is a deficient number, since it is larger than the sum of its proper divisors (199828358).

398840986 is a wasteful number, since it uses less digits than its factorization.

398840986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135956.

The product of its (nonzero) digits is 2985984, while the sum is 55.

The square root of 398840986 is about 19971.0036302636. The cubic root of 398840986 is about 736.0939706044.

The spelling of 398840986 in words is "three hundred ninety-eight million, eight hundred forty thousand, nine hundred eighty-six".