394729669 has 2 divisors, whose sum is σ = 394729670. Its totient is φ = 394729668.

The previous prime is 394729667. The next prime is 394729711. The reversal of 394729669 is 966927493.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 248440644 + 146289025 = 15762^2 + 12095^2 .

It is a cyclic number.

It is not a de Polignac number, because 394729669 - 2¹ = 394729667 is a prime.

It is a super-2 number, since 2×394729669² = 311623023177699122, which contains 22 as substring.

Together with 394729667, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (394729663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 197364834 + 197364835.

It is an arithmetic number, because the mean of its divisors is an integer number (197364835).

Almost surely, 2^394729669 is an apocalyptic number.

It is an amenable number.

394729669 is a deficient number, since it is larger than the sum of its proper divisors (1).

394729669 is an equidigital number, since it uses as much as digits as its factorization.

394729669 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4408992, while the sum is 55.

The square root of 394729669 is about 19867.8048359651. The cubic root of 394729669 is about 733.5559714963. Note that the first 3 decimals are identical.

It can be divided in two parts, 39472 and 9669, that added together give a triangular number (49141 = T₃₁₃).

The spelling of 394729669 in words is "three hundred ninety-four million, seven hundred twenty-nine thousand, six hundred sixty-nine".