394377720026 has 16 divisors (see below), whose sum is σ = 607718044104. Its totient is φ = 191807901504.

The previous prime is 394377720019. The next prime is 394377720031. The reversal of 394377720026 is 620027773493.

It is a Cunningham number, because it is equal to 627995²+1.

It can be written as a sum of positive squares in 4 ways, for example, as 352894214401 + 41483505625 = 594049^2 + 203675^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 437585 + ... + 990068.

Almost surely, 2^394377720026 is an apocalyptic number.

394377720026 is a deficient number, since it is larger than the sum of its proper divisors (213340324078).

394377720026 is a wasteful number, since it uses less digits than its factorization.

394377720026 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1431425.

The product of its (nonzero) digits is 2667168, while the sum is 50.

The spelling of 394377720026 in words is "three hundred ninety-four billion, three hundred seventy-seven million, seven hundred twenty thousand, twenty-six".