378559217 has 4 divisors (see below), whose sum is σ = 378608100. Its totient is φ = 378510336.

The previous prime is 378559199. The next prime is 378559241. The reversal of 378559217 is 712955873.

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 24216241 + 354342976 = 4921^2 + 18824^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-378559217 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (378559117) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9968 + ... + 29265.

It is an arithmetic number, because the mean of its divisors is an integer number (94652025).

Almost surely, 2^378559217 is an apocalyptic number.

It is an amenable number.

378559217 is a deficient number, since it is larger than the sum of its proper divisors (48883).

378559217 is an equidigital number, since it uses as much as digits as its factorization.

378559217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48882.

The product of its digits is 529200, while the sum is 47.

The square root of 378559217 is about 19456.5982895264. The cubic root of 378559217 is about 723.3990624341.

The spelling of 378559217 in words is "three hundred seventy-eight million, five hundred fifty-nine thousand, two hundred seventeen".