378928809 has 18 divisors (see below), whose sum is σ = 636704250. Its totient is φ = 216530496.

The previous prime is 378928807. The next prime is 378928811. The reversal of 378928809 is 908829873.

It is an interprime number because it is at equal distance from previous prime (378928807) and next prime (378928811).

It can be written as a sum of positive squares in only one way, i.e., 277322409 + 101606400 = 16653^2 + 10080^2 .

It is not a de Polignac number, because 378928809 - 2¹ = 378928807 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (378928807) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 429184 + ... + 430065.

Almost surely, 2^378928809 is an apocalyptic number.

It is an amenable number.

378928809 is a deficient number, since it is larger than the sum of its proper divisors (257775441).

378928809 is a wasteful number, since it uses less digits than its factorization.

378928809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 859269 (or 859259 counting only the distinct ones).

The product of its (nonzero) digits is 1741824, while the sum is 54.

The square root of 378928809 is about 19466.0938300420. The cubic root of 378928809 is about 723.6344069823.

The spelling of 378928809 in words is "three hundred seventy-eight million, nine hundred twenty-eight thousand, eight hundred nine".