398263808 has 20 divisors (see below), whose sum is σ = 795750780. Its totient is φ = 199131648.

The previous prime is 398263787. The next prime is 398263813. The reversal of 398263808 is 808362893.

It is a happy number.

It is a super-2 number, since 2×398263808² = 317228121525321728, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 388418 + ... + 389441.

It is an arithmetic number, because the mean of its divisors is an integer number (39787539).

Almost surely, 2^398263808 is an apocalyptic number.

It is an amenable number.

398263808 is a deficient number, since it is larger than the sum of its proper divisors (397486972).

398263808 is an frugal number, since it uses more digits than its factorization.

398263808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 777877 (or 777861 counting only the distinct ones).

The product of its (nonzero) digits is 497664, while the sum is 47.

The square root of 398263808 is about 19956.5479980882. The cubic root of 398263808 is about 735.7387226334.

It can be divided in two parts, 39826 and 3808, that added together give a palindrome (43634).

The spelling of 398263808 in words is "three hundred ninety-eight million, two hundred sixty-three thousand, eight hundred eight".