394531679770 has 16 divisors (see below), whose sum is σ = 710188086600. Its totient is φ = 157805769024.

The previous prime is 394531679753. The next prime is 394531679779. The reversal of 394531679770 is 77976135493.

It can be written as a sum of positive squares in 4 ways, for example, as 236961583369 + 157570096401 = 486787^2 + 396951^2 .

It is a junction number, because it is equal to n+sod(n) for n = 394531679699 and 394531679708.

It is not an unprimeable number, because it can be changed into a prime (394531679779) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 619545 + ... + 1083004.

Almost surely, 2^394531679770 is an apocalyptic number.

394531679770 is a deficient number, since it is larger than the sum of its proper divisors (315656406830).

394531679770 is a wasteful number, since it uses less digits than its factorization.

394531679770 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1725729.

The product of its (nonzero) digits is 30005640, while the sum is 61.

The spelling of 394531679770 in words is "three hundred ninety-four billion, five hundred thirty-one million, six hundred seventy-nine thousand, seven hundred seventy".