398708688 has 160 divisors (see below), whose sum is σ = 1223929600. Its totient is φ = 111767040.

The previous prime is 398708621. The next prime is 398708689. The reversal of 398708688 is 886807893.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (398708689) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 1004106 + ... + 1004502.

It is an arithmetic number, because the mean of its divisors is an integer number (7649560).

Almost surely, 2^398708688 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 398708688, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (611964800).

398708688 is an abundant number, since it is smaller than the sum of its proper divisors (825220912).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

398708688 is a wasteful number, since it uses less digits than its factorization.

398708688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 490 (or 470 counting only the distinct ones).

The product of its (nonzero) digits is 4644864, while the sum is 57.

The square root of 398708688 is about 19967.6911033800. The cubic root of 398708688 is about 736.0125726428.

The spelling of 398708688 in words is "three hundred ninety-eight million, seven hundred eight thousand, six hundred eighty-eight".