378819761 has 4 divisors (see below), whose sum is σ = 379393524. Its totient is φ = 378246000.

The previous prime is 378819751. The next prime is 378819767. The reversal of 378819761 is 167918873.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 326344225 + 52475536 = 18065^2 + 7244^2 .

It is a cyclic number.

It is not a de Polignac number, because 378819761 - 2¹⁴ = 378803377 is a prime.

It is a super-2 number, since 2×378819761² = 287008822648194242, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (378819767) 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 3 ways as a sum of consecutive naturals, for example, 285890 + ... + 287211.

It is an arithmetic number, because the mean of its divisors is an integer number (94848381).

Almost surely, 2^378819761 is an apocalyptic number.

It is an amenable number.

378819761 is a deficient number, since it is larger than the sum of its proper divisors (573763).

378819761 is an equidigital number, since it uses as much as digits as its factorization.

378819761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 573762.

The product of its digits is 508032, while the sum is 50.

The square root of 378819761 is about 19463.2926556634. The cubic root of 378819761 is about 723.5649845704.

The spelling of 378819761 in words is "three hundred seventy-eight million, eight hundred nineteen thousand, seven hundred sixty-one".