385272869 has 2 divisors, whose sum is σ = 385272870. Its totient is φ = 385272868.

The previous prime is 385272857. The next prime is 385272893. The reversal of 385272869 is 968272583.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 269452225 + 115820644 = 16415^2 + 10762^2 .

It is a cyclic number.

It is not a de Polignac number, because 385272869 - 2²⁴ = 368495653 is a prime.

It is a super-2 number, since 2×385272869² = 296870367174982322, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (385272269) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 192636434 + 192636435.

It is an arithmetic number, because the mean of its divisors is an integer number (192636435).

Almost surely, 2^385272869 is an apocalyptic number.

It is an amenable number.

385272869 is a deficient number, since it is larger than the sum of its proper divisors (1).

385272869 is an equidigital number, since it uses as much as digits as its factorization.

385272869 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1451520, while the sum is 50.

The square root of 385272869 is about 19628.3689847119. The cubic root of 385272869 is about 727.6504612765.

The spelling of 385272869 in words is "three hundred eighty-five million, two hundred seventy-two thousand, eight hundred sixty-nine".