398897856 has 336 divisors, whose sum is σ = 1420124160. Its totient is φ = 104509440.

The previous prime is 398897803. The next prime is 398897861. The reversal of 398897856 is 658798893.

It is a tau number, because it is divible by the number of its divisors (336).

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a junction number, because it is equal to n+sod(n) for n = 398897793 and 398897802.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3140865 + ... + 3140991.

It is an arithmetic number, because the mean of its divisors is an integer number (4226560).

Almost surely, 2^398897856 is an apocalyptic number.

398897856 is a gapful number since it is divisible by the number (36) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 398897856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (710062080).

398897856 is an abundant number, since it is smaller than the sum of its proper divisors (1021226304).

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

398897856 is a wasteful number, since it uses less digits than its factorization.

398897856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 212 (or 199 counting only the distinct ones).

The product of its digits is 26127360, while the sum is 63.

The square root of 398897856 is about 19972.4273937847. The cubic root of 398897856 is about 736.1289550351.

The spelling of 398897856 in words is "three hundred ninety-eight million, eight hundred ninety-seven thousand, eight hundred fifty-six".