398671776 has 72 divisors (see below), whose sum is σ = 1142485344. Its totient is φ = 131863680.

The previous prime is 398671769. The next prime is 398671789. The reversal of 398671776 is 677176893.

It is a tau number, because it is divible by the number of its divisors (72).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 32445 + ... + 43011.

It is an arithmetic number, because the mean of its divisors is an integer number (15867852).

Almost surely, 2^398671776 is an apocalyptic number.

398671776 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 398671776, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (571242672).

398671776 is an abundant number, since it is smaller than the sum of its proper divisors (743813568).

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

398671776 is a wasteful number, since it uses less digits than its factorization.

398671776 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10714 (or 10703 counting only the distinct ones).

The product of its digits is 2667168, while the sum is 54.

The square root of 398671776 is about 19966.7667888419. The cubic root of 398671776 is about 735.9898588710.

The spelling of 398671776 in words is "three hundred ninety-eight million, six hundred seventy-one thousand, seven hundred seventy-six".