385266391 has 2 divisors, whose sum is σ = 385266392. Its totient is φ = 385266390.

The previous prime is 385266367. The next prime is 385266433. The reversal of 385266391 is 193662583.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 385266391 - 2⁷ = 385266263 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (385261391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 192633195 + 192633196.

It is an arithmetic number, because the mean of its divisors is an integer number (192633196).

Almost surely, 2^385266391 is an apocalyptic number.

385266391 is a deficient number, since it is larger than the sum of its proper divisors (1).

385266391 is an equidigital number, since it uses as much as digits as its factorization.

385266391 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 233280, while the sum is 43.

The square root of 385266391 is about 19628.2039677603. The cubic root of 385266391 is about 727.6463830015.

The spelling of 385266391 in words is "three hundred eighty-five million, two hundred sixty-six thousand, three hundred ninety-one".