398216782 has 16 divisors (see below), whose sum is σ = 629571600. Its totient is φ = 188386560.

The previous prime is 398216773. The next prime is 398216809. The reversal of 398216782 is 287612893.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25182 + ... + 37822.

It is an arithmetic number, because the mean of its divisors is an integer number (39348225).

Almost surely, 2^398216782 is an apocalyptic number.

398216782 is a deficient number, since it is larger than the sum of its proper divisors (231354818).

398216782 is a wasteful number, since it uses less digits than its factorization.

398216782 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13491.

The product of its digits is 290304, while the sum is 46.

The square root of 398216782 is about 19955.3697535275. The cubic root of 398216782 is about 735.7097634273.

The spelling of 398216782 in words is "three hundred ninety-eight million, two hundred sixteen thousand, seven hundred eighty-two".