398064864 has 96 divisors (see below), whose sum is σ = 1099042560. Its totient is φ = 125908992.

The previous prime is 398064857. The next prime is 398064883. The reversal of 398064864 is 468460893.

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 306264 + ... + 307560.

It is an arithmetic number, because the mean of its divisors is an integer number (11448360).

Almost surely, 2^398064864 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 398064864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (549521280).

398064864 is an abundant number, since it is smaller than the sum of its proper divisors (700977696).

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

398064864 is a wasteful number, since it uses less digits than its factorization.

398064864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1472 (or 1464 counting only the distinct ones).

The product of its (nonzero) digits is 995328, while the sum is 48.

The square root of 398064864 is about 19951.5629462957. The cubic root of 398064864 is about 735.6161948177.

The spelling of 398064864 in words is "three hundred ninety-eight million, sixty-four thousand, eight hundred sixty-four".