6399378 has 32 divisors (see below), whose sum is σ = 15059520. Its totient is φ = 2007360.

The previous prime is 6399377. The next prime is 6399391. The reversal of 6399378 is 8739936.

It is a happy number.

6399378 is a `hidden beast` number, since 639 + 9 + 3 + 7 + 8 = 666.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (6399377) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2568 + ... + 4403.

It is an arithmetic number, because the mean of its divisors is an integer number (470610).

Almost surely, 2^6399378 is an apocalyptic number.

6399378 is an abundant number, since it is smaller than the sum of its proper divisors (8660142).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6399378 is a wasteful number, since it uses less digits than its factorization.

6399378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6999 (or 6993 counting only the distinct ones).

The product of its digits is 244944, while the sum is 45.

The square root of 6399378 is about 2529.6991916036. The cubic root of 6399378 is about 185.6575384241.

The spelling of 6399378 in words is "six million, three hundred ninety-nine thousand, three hundred seventy-eight".