394012669 has 2 divisors, whose sum is σ = 394012670. Its totient is φ = 394012668.

The previous prime is 394012657. The next prime is 394012673. The reversal of 394012669 is 966210493.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 229916569 + 164096100 = 15163^2 + 12810^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-394012669 is a prime.

It is a super-2 number, since 2×394012669² = 310491966665007122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (394012169) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 197006334 + 197006335.

It is an arithmetic number, because the mean of its divisors is an integer number (197006335).

Almost surely, 2^394012669 is an apocalyptic number.

It is an amenable number.

394012669 is a deficient number, since it is larger than the sum of its proper divisors (1).

394012669 is an equidigital number, since it uses as much as digits as its factorization.

394012669 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 69984, while the sum is 40.

The square root of 394012669 is about 19849.7523662135. The cubic root of 394012669 is about 733.1115505406. Note that the first 3 decimals are identical.

The spelling of 394012669 in words is "three hundred ninety-four million, twelve thousand, six hundred sixty-nine".