398993280 has 192 divisors, whose sum is σ = 1479779280. Its totient is φ = 91176960.

The previous prime is 398993279. The next prime is 398993291. The reversal of 398993280 is 82399893.

It is a tau number, because it is divible by the number of its divisors (192).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 91960 + ... + 96200.

Almost surely, 2^398993280 is an apocalyptic number.

398993280 is a gapful number since it is divisible by the number (30) 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 398993280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (739889640).

398993280 is an abundant number, since it is smaller than the sum of its proper divisors (1080786000).

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

398993280 is a wasteful number, since it uses less digits than its factorization.

398993280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4277 (or 4258 counting only the distinct ones).

The product of its (nonzero) digits is 839808, while the sum is 51.

The square root of 398993280 is about 19974.8161443353. The cubic root of 398993280 is about 736.1876490657.

The spelling of 398993280 in words is "three hundred ninety-eight million, nine hundred ninety-three thousand, two hundred eighty".