398061308240 has 40 divisors (see below), whose sum is σ = 925554151368. Its totient is φ = 159213923840.

The previous prime is 398061308233. The next prime is 398061308251. The reversal of 398061308240 is 42803160893.

It is a Cunningham number, because it is equal to 630921²-1.

It can be written as a sum of positive squares in 4 ways, for example, as 18141934864 + 379919373376 = 134692^2 + 616376^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a junction number, because it is equal to n+sod(n) for n = 398061308191 and 398061308200.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1104110 + ... + 1419570.

Almost surely, 2^398061308240 is an apocalyptic number.

It is an amenable number.

398061308240 is an abundant number, since it is smaller than the sum of its proper divisors (527492843128).

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

398061308240 is a wasteful number, since it uses less digits than its factorization.

398061308240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 331247 (or 331241 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 44.

The spelling of 398061308240 in words is "three hundred ninety-eight billion, sixty-one million, three hundred eight thousand, two hundred forty".