384332813 has 6 divisors (see below), whose sum is σ = 387177546. Its totient is φ = 381508832.

The previous prime is 384332807. The next prime is 384332831. The reversal of 384332813 is 318233483.

It can be written as a sum of positive squares in 3 ways, for example, as 134629609 + 249703204 = 11603^2 + 15802^2 .

It is not a de Polignac number, because 384332813 - 2⁶ = 384332749 is a prime.

It is a super-2 number, since 2×384332813² = 295423422296985938, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (384332873) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 8531 + ... + 29007.

It is an arithmetic number, because the mean of its divisors is an integer number (64529591).

Almost surely, 2^384332813 is an apocalyptic number.

It is an amenable number.

384332813 is a deficient number, since it is larger than the sum of its proper divisors (2844733).

384332813 is an equidigital number, since it uses as much as digits as its factorization.

384332813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20751 (or 20614 counting only the distinct ones).

The product of its digits is 41472, while the sum is 35.

The square root of 384332813 is about 19604.4079992230. The cubic root of 384332813 is about 727.0581630788.

The spelling of 384332813 in words is "three hundred eighty-four million, three hundred thirty-two thousand, eight hundred thirteen".