398444686 has 8 divisors (see below), whose sum is σ = 623652624. Its totient is φ = 190560480.

The previous prime is 398444621. The next prime is 398444699. The reversal of 398444686 is 686444893.

It is a happy number.

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

It is a congruent 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, 4330875 + ... + 4330966.

It is an arithmetic number, because the mean of its divisors is an integer number (77956578).

Almost surely, 2^398444686 is an apocalyptic number.

398444686 is a deficient number, since it is larger than the sum of its proper divisors (225207938).

398444686 is a wasteful number, since it uses less digits than its factorization.

398444686 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8661866.

The product of its digits is 3981312, while the sum is 52.

The square root of 398444686 is about 19961.0792794378. The cubic root of 398444686 is about 735.8500883533.

The spelling of 398444686 in words is "three hundred ninety-eight million, four hundred forty-four thousand, six hundred eighty-six".