398099856 has 160 divisors (see below), whose sum is σ = 1349913600. Its totient is φ = 97943040.

The previous prime is 398099851. The next prime is 398099869. The reversal of 398099856 is 658990893.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is a junction number, because it is equal to n+sod(n) for n = 398099796 and 398099805.

It is not an unprimeable number, because it can be changed into a prime (398099851) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 67390 + ... + 73058.

It is an arithmetic number, because the mean of its divisors is an integer number (8436960).

Almost surely, 2^398099856 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 398099856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (674956800).

398099856 is an abundant number, since it is smaller than the sum of its proper divisors (951813744).

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

398099856 is a wasteful number, since it uses less digits than its factorization.

398099856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5717 (or 5711 counting only the distinct ones).

The product of its (nonzero) digits is 4199040, while the sum is 57.

The square root of 398099856 is about 19952.4398508052. The cubic root of 398099856 is about 735.6377490333.

The spelling of 398099856 in words is "three hundred ninety-eight million, ninety-nine thousand, eight hundred fifty-six".