847384381 has 2 divisors, whose sum is σ = 847384382. Its totient is φ = 847384380.

The previous prime is 847384357. The next prime is 847384409. The reversal of 847384381 is 183483748.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 837176356 + 10208025 = 28934^2 + 3195^2 .

It is a cyclic number.

It is not a de Polignac number, because 847384381 - 2²¹ = 845287229 is a prime.

It is a super-2 number, since 2×847384381² = 1436120578325506322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (847384081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 423692190 + 423692191.

It is an arithmetic number, because the mean of its divisors is an integer number (423692191).

Almost surely, 2^847384381 is an apocalyptic number.

It is an amenable number.

847384381 is a deficient number, since it is larger than the sum of its proper divisors (1).

847384381 is an equidigital number, since it uses as much as digits as its factorization.

847384381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 516096, while the sum is 46.

The square root of 847384381 is about 29109.8674163934. The cubic root of 847384381 is about 946.2955945961.

The spelling of 847384381 in words is "eight hundred forty-seven million, three hundred eighty-four thousand, three hundred eighty-one".