378787917 has 8 divisors (see below), whose sum is σ = 512588896. Its totient is φ = 248756112.

The previous prime is 378787909. The next prime is 378787919. The reversal of 378787917 is 719787873.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 378787917 - 2³ = 378787909 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 (378787919) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 942058 + ... + 942459.

It is an arithmetic number, because the mean of its divisors is an integer number (64073612).

Almost surely, 2^378787917 is an apocalyptic number.

It is an amenable number.

378787917 is a deficient number, since it is larger than the sum of its proper divisors (133800979).

378787917 is a wasteful number, since it uses less digits than its factorization.

378787917 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1884587.

The product of its digits is 4148928, while the sum is 57.

The square root of 378787917 is about 19462.4745857252. The cubic root of 378787917 is about 723.5447094498.

The spelling of 378787917 in words is "three hundred seventy-eight million, seven hundred eighty-seven thousand, nine hundred seventeen".