398888064 has 160 divisors (see below), whose sum is σ = 1204579200. Its totient is φ = 131010048.

The previous prime is 398888059. The next prime is 398888101. The reversal of 398888064 is 460888893.

It is a super-2 number, since 2×398888064² = 318223375203336192, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a self number, because there is not a number n which added to its sum of digits gives 398888064.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 818829 + ... + 819315.

It is an arithmetic number, because the mean of its divisors is an integer number (7528620).

Almost surely, 2^398888064 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 398888064, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (602289600).

398888064 is an abundant number, since it is smaller than the sum of its proper divisors (805691136).

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

398888064 is an equidigital number, since it uses as much as digits as its factorization.

398888064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 592 (or 571 counting only the distinct ones).

The product of its (nonzero) digits is 2654208, while the sum is 54.

The square root of 398888064 is about 19972.1822543256. The cubic root of 398888064 is about 736.1229315769.

The spelling of 398888064 in words is "three hundred ninety-eight million, eight hundred eighty-eight thousand, sixty-four".