384691669 has 2 divisors, whose sum is σ = 384691670. Its totient is φ = 384691668.

The previous prime is 384691667. The next prime is 384691673. The reversal of 384691669 is 966196483.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 247684644 + 137007025 = 15738^2 + 11705^2 .

It is a cyclic number.

It is not a de Polignac number, because 384691669 - 2¹ = 384691667 is a prime.

It is a super-2 number, since 2×384691669² = 295975360396011122, which contains 22 as substring.

Together with 384691667, 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 (384691667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 192345834 + 192345835.

It is an arithmetic number, because the mean of its divisors is an integer number (192345835).

Almost surely, 2^384691669 is an apocalyptic number.

It is an amenable number.

384691669 is a deficient number, since it is larger than the sum of its proper divisors (1).

384691669 is an equidigital number, since it uses as much as digits as its factorization.

384691669 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1679616, while the sum is 52.

The square root of 384691669 is about 19613.5582952202. The cubic root of 384691669 is about 727.2843802295.

The spelling of 384691669 in words is "three hundred eighty-four million, six hundred ninety-one thousand, six hundred sixty-nine".