398356986 has 8 divisors (see below), whose sum is σ = 796713984. Its totient is φ = 132785660.

The previous prime is 398356961. The next prime is 398356991. The reversal of 398356986 is 689653893.

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

398356986 is an admirable number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33196410 + ... + 33196421.

It is an arithmetic number, because the mean of its divisors is an integer number (99589248).

Almost surely, 2^398356986 is an apocalyptic number.

398356986 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

398356986 is a wasteful number, since it uses less digits than its factorization.

398356986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66392836.

The product of its digits is 8398080, while the sum is 57.

The square root of 398356986 is about 19958.8823835404. The cubic root of 398356986 is about 735.7960960926.

The spelling of 398356986 in words is "three hundred ninety-eight million, three hundred fifty-six thousand, nine hundred eighty-six".