394978308240 has 80 divisors (see below), whose sum is σ = 1224599745600. Its totient is φ = 105313184256.

The previous prime is 394978308211. The next prime is 394978308251. The reversal of 394978308240 is 42803879493.

It is a tau number, because it is divible by the number of its divisors (80).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1712931 + ... + 1929789.

It is an arithmetic number, because the mean of its divisors is an integer number (15307496820).

Almost surely, 2^394978308240 is an apocalyptic number.

394978308240 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

394978308240 is an abundant number, since it is smaller than the sum of its proper divisors (829621437360).

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

394978308240 is a wasteful number, since it uses less digits than its factorization.

394978308240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 224464 (or 224458 counting only the distinct ones).

The product of its (nonzero) digits is 10450944, while the sum is 57.

The spelling of 394978308240 in words is "three hundred ninety-four billion, nine hundred seventy-eight million, three hundred eight thousand, two hundred forty".