394827492609 has 75 divisors (see below), whose sum is σ = 649906758435. Its totient is φ = 238874676480.

The previous prime is 394827492571. The next prime is 394827492611. The reversal of 394827492609 is 906294728493.

The square root of 394827492609 is 628353.

It is a perfect power (a square), and thus also a powerful number.

394827492609 is a `hidden beast` number, since 3 + 9 + 4 + 82 + 7 + 492 + 60 + 9 = 666.

It can be written as a sum of positive squares in only one way, i.e., 392095130625 + 2732361984 = 626175^2 + 52272^2 .

It is not a de Polignac number, because 394827492609 - 2⁹ = 394827492097 is a prime.

It is not an unprimeable number, because it can be changed into a prime (394827493609) by changing a digit.

It is a polite number, since it can be written in 74 ways as a sum of consecutive naturals, for example, 684276129 + ... + 684276705.

Almost surely, 2^394827492609 is an apocalyptic number.

394827492609 is the 628353-rd square number.

394827492609 is the 314177-th centered octagonal number.

It is an amenable number.

394827492609 is a deficient number, since it is larger than the sum of its proper divisors (255079265826).

394827492609 is an frugal number, since it uses more digits than its factorization.

394827492609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1210 (or 591 counting only the distinct ones).

The product of its (nonzero) digits is 47029248, while the sum is 63.

The spelling of 394827492609 in words is "three hundred ninety-four billion, eight hundred twenty-seven million, four hundred ninety-two thousand, six hundred nine".