378231813 has 6 divisors (see below), whose sum is σ = 546334854. Its totient is φ = 252154536.

The previous prime is 378231779. The next prime is 378231823. The reversal of 378231813 is 318132873.

It can be written as a sum of positive squares in only one way, i.e., 198725409 + 179506404 = 14097^2 + 13398^2 .

It is not a de Polignac number, because 378231813 - 2¹³ = 378223621 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (378231823) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 21012870 + ... + 21012887.

It is an arithmetic number, because the mean of its divisors is an integer number (91055809).

Almost surely, 2^378231813 is an apocalyptic number.

It is an amenable number.

378231813 is a deficient number, since it is larger than the sum of its proper divisors (168103041).

378231813 is a wasteful number, since it uses less digits than its factorization.

378231813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42025763 (or 42025760 counting only the distinct ones).

The product of its digits is 24192, while the sum is 36.

The square root of 378231813 is about 19448.1827685776. The cubic root of 378231813 is about 723.1904538921.

The spelling of 378231813 in words is "three hundred seventy-eight million, two hundred thirty-one thousand, eight hundred thirteen".