378102817 has 4 divisors (see below), whose sum is σ = 378320260. Its totient is φ = 377885376.

The previous prime is 378102757. The next prime is 378102821. The reversal of 378102817 is 718201873.

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 24512401 + 353590416 = 4951^2 + 18804^2 .

It is a cyclic number.

It is not a de Polignac number, because 378102817 - 2²³ = 369714209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (378102017) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 106092 + ... + 109597.

It is an arithmetic number, because the mean of its divisors is an integer number (94580065).

Almost surely, 2^378102817 is an apocalyptic number.

It is an amenable number.

378102817 is a deficient number, since it is larger than the sum of its proper divisors (217443).

378102817 is a wasteful number, since it uses less digits than its factorization.

378102817 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 217442.

The product of its (nonzero) digits is 18816, while the sum is 37.

The square root of 378102817 is about 19444.8660833650. The cubic root of 378102817 is about 723.1082298168.

The spelling of 378102817 in words is "three hundred seventy-eight million, one hundred two thousand, eight hundred seventeen".