398641698 has 96 divisors (see below), whose sum is σ = 1119081600. Its totient is φ = 99595008.

The previous prime is 398641657. The next prime is 398641751. The reversal of 398641698 is 896146893.

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 47 ways as a sum of consecutive naturals, for example, 24718 + ... + 37526.

It is an arithmetic number, because the mean of its divisors is an integer number (11657100).

Almost surely, 2^398641698 is an apocalyptic number.

398641698 is a gapful number since it is divisible by the number (38) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 398641698, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (559540800).

398641698 is an abundant number, since it is smaller than the sum of its proper divisors (720439902).

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

398641698 is a wasteful number, since it uses less digits than its factorization.

398641698 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12856 (or 12853 counting only the distinct ones).

The product of its digits is 2239488, while the sum is 54.

The square root of 398641698 is about 19966.0135730696. The cubic root of 398641698 is about 735.9713493593.

The spelling of 398641698 in words is "three hundred ninety-eight million, six hundred forty-one thousand, six hundred ninety-eight".