384895781 has 2 divisors, whose sum is σ = 384895782. Its totient is φ = 384895780.

The previous prime is 384895769. The next prime is 384895813. The reversal of 384895781 is 187598483.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 374229025 + 10666756 = 19345^2 + 3266^2 .

It is a cyclic number.

It is not a de Polignac number, because 384895781 - 2⁶ = 384895717 is a prime.

It is a super-2 number, since 2×384895781² = 296289524463199922, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (384895081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 192447890 + 192447891.

It is an arithmetic number, because the mean of its divisors is an integer number (192447891).

Almost surely, 2^384895781 is an apocalyptic number.

It is an amenable number.

384895781 is a deficient number, since it is larger than the sum of its proper divisors (1).

384895781 is an equidigital number, since it uses as much as digits as its factorization.

384895781 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1935360, while the sum is 53.

The square root of 384895781 is about 19618.7609445653. The cubic root of 384895781 is about 727.4129864479.

The spelling of 384895781 in words is "three hundred eighty-four million, eight hundred ninety-five thousand, seven hundred eighty-one".