384921287 has 2 divisors, whose sum is σ = 384921288. Its totient is φ = 384921286.

The previous prime is 384921283. The next prime is 384921289. The reversal of 384921287 is 782129483.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 384921287 - 2² = 384921283 is a prime.

Together with 384921289, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (384921281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 192460643 + 192460644.

It is an arithmetic number, because the mean of its divisors is an integer number (192460644).

Almost surely, 2^384921287 is an apocalyptic number.

384921287 is a deficient number, since it is larger than the sum of its proper divisors (1).

384921287 is an equidigital number, since it uses as much as digits as its factorization.

384921287 is an evil number, because the sum of its binary digits is even.

The product of its digits is 193536, while the sum is 44.

The square root of 384921287 is about 19619.4109748484. The cubic root of 384921287 is about 727.4290539886.

The spelling of 384921287 in words is "three hundred eighty-four million, nine hundred twenty-one thousand, two hundred eighty-seven".