378649717 has 4 divisors (see below), whose sum is σ = 390864256. Its totient is φ = 366435180.

The previous prime is 378649703. The next prime is 378649741. The reversal of 378649717 is 717946873.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-378649717 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (378646717) 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, 6107223 + ... + 6107284.

It is an arithmetic number, because the mean of its divisors is an integer number (97716064).

Almost surely, 2^378649717 is an apocalyptic number.

It is an amenable number.

378649717 is a deficient number, since it is larger than the sum of its proper divisors (12214539).

378649717 is a wasteful number, since it uses less digits than its factorization.

378649717 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12214538.

The product of its digits is 1778112, while the sum is 52.

The square root of 378649717 is about 19458.9238397194. The cubic root of 378649717 is about 723.4567041415.

The spelling of 378649717 in words is "three hundred seventy-eight million, six hundred forty-nine thousand, seven hundred seventeen".