384619891 has 2 divisors, whose sum is σ = 384619892. Its totient is φ = 384619890.

The previous prime is 384619843. The next prime is 384619901. The reversal of 384619891 is 198916483.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 384619891 - 2⁹ = 384619379 is a prime.

It is not a weakly prime, because it can be changed into another prime (384679891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 192309945 + 192309946.

It is an arithmetic number, because the mean of its divisors is an integer number (192309946).

Almost surely, 2^384619891 is an apocalyptic number.

384619891 is a deficient number, since it is larger than the sum of its proper divisors (1).

384619891 is an equidigital number, since it uses as much as digits as its factorization.

384619891 is an evil number, because the sum of its binary digits is even.

The product of its digits is 373248, while the sum is 49.

The square root of 384619891 is about 19611.7284041973. The cubic root of 384619891 is about 727.2391437717.

The spelling of 384619891 in words is "three hundred eighty-four million, six hundred nineteen thousand, eight hundred ninety-one".