398787280 has 20 divisors (see below), whose sum is σ = 927180612. Its totient is φ = 159514880.

The previous prime is 398787229. The next prime is 398787281. The reversal of 398787280 is 82787893.

It can be written as a sum of positive squares in 2 ways, for example, as 163226176 + 235561104 = 12776^2 + 15348^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (398787281) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2492341 + ... + 2492500.

Almost surely, 2^398787280 is an apocalyptic number.

It is an amenable number.

398787280 is an abundant number, since it is smaller than the sum of its proper divisors (528393332).

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

398787280 is a wasteful number, since it uses less digits than its factorization.

398787280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4984854 (or 4984848 counting only the distinct ones).

The product of its (nonzero) digits is 1354752, while the sum is 52.

The square root of 398787280 is about 19969.6589855711. The cubic root of 398787280 is about 736.0609295021.

The spelling of 398787280 in words is "three hundred ninety-eight million, seven hundred eighty-seven thousand, two hundred eighty".