398656658 has 4 divisors (see below), whose sum is σ = 597984990. Its totient is φ = 199328328.

The previous prime is 398656637. The next prime is 398656669. The reversal of 398656658 is 856656893.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 229734649 + 168922009 = 15157^2 + 12997^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99664163 + ... + 99664166.

Almost surely, 2^398656658 is an apocalyptic number.

398656658 is a deficient number, since it is larger than the sum of its proper divisors (199328332).

398656658 is a wasteful number, since it uses less digits than its factorization.

398656658 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 199328331.

The product of its digits is 9331200, while the sum is 56.

The square root of 398656658 is about 19966.3882061829. The cubic root of 398656658 is about 735.9805556162.

The spelling of 398656658 in words is "three hundred ninety-eight million, six hundred fifty-six thousand, six hundred fifty-eight".