394900377561 has 24 divisors (see below), whose sum is σ = 577274696544. Its totient is φ = 260108616960.

The previous prime is 394900377493. The next prime is 394900377583. The reversal of 394900377561 is 165773009493.

It is a happy number.

394900377561 is a `hidden beast` number, since 3 + 9 + 4 + 9 + 0 + 0 + 3 + 77 + 561 = 666.

It is not a de Polignac number, because 394900377561 - 2¹⁸ = 394900115417 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 394900377498 and 394900377507.

It is not an unprimeable number, because it can be changed into a prime (394900377061) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 127146 + ... + 897756.

It is an arithmetic number, because the mean of its divisors is an integer number (24053112356).

Almost surely, 2^394900377561 is an apocalyptic number.

It is an amenable number.

394900377561 is a deficient number, since it is larger than the sum of its proper divisors (182374318983).

394900377561 is a wasteful number, since it uses less digits than its factorization.

394900377561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 771301 (or 771298 counting only the distinct ones).

The product of its (nonzero) digits is 4286520, while the sum is 54.

The spelling of 394900377561 in words is "three hundred ninety-four billion, nine hundred million, three hundred seventy-seven thousand, five hundred sixty-one".