398721710 has 16 divisors (see below), whose sum is σ = 719257536. Its totient is φ = 159142368.

The previous prime is 398721677. The next prime is 398721737. The reversal of 398721710 is 17127893.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38429 + ... + 47688.

It is an arithmetic number, because the mean of its divisors is an integer number (44953596).

Almost surely, 2^398721710 is an apocalyptic number.

398721710 is a deficient number, since it is larger than the sum of its proper divisors (320535826).

398721710 is a wasteful number, since it uses less digits than its factorization.

398721710 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86587.

The product of its (nonzero) digits is 21168, while the sum is 38.

The square root of 398721710 is about 19968.0171774766. The cubic root of 398721710 is about 736.0205853864.

The spelling of 398721710 in words is "three hundred ninety-eight million, seven hundred twenty-one thousand, seven hundred ten".