394840469 has 2 divisors, whose sum is σ = 394840470. Its totient is φ = 394840468.

The previous prime is 394840441. The next prime is 394840493. The reversal of 394840469 is 964048493.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 343546225 + 51294244 = 18535^2 + 7162^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-394840469 is a prime.

It is a super-2 number, since 2×394840469² = 311797991920279922, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (394840409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 197420234 + 197420235.

It is an arithmetic number, because the mean of its divisors is an integer number (197420235).

Almost surely, 2^394840469 is an apocalyptic number.

It is an amenable number.

394840469 is a deficient number, since it is larger than the sum of its proper divisors (1).

394840469 is an equidigital number, since it uses as much as digits as its factorization.

394840469 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 746496, while the sum is 47.

The square root of 394840469 is about 19870.5930711693. The cubic root of 394840469 is about 733.6246010795.

The spelling of 394840469 in words is "three hundred ninety-four million, eight hundred forty thousand, four hundred sixty-nine".