6403378 has 4 divisors (see below), whose sum is σ = 9605070. Its totient is φ = 3201688.

The previous prime is 6403363. The next prime is 6403379. The reversal of 6403378 is 8733046.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 6315169 + 88209 = 2513^2 + 297^2 .

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (6403379) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1600843 + ... + 1600846.

Almost surely, 2^6403378 is an apocalyptic number.

6403378 is a deficient number, since it is larger than the sum of its proper divisors (3201692).

6403378 is a wasteful number, since it uses less digits than its factorization.

6403378 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3201691.

The product of its (nonzero) digits is 12096, while the sum is 31.

The square root of 6403378 is about 2530.4896759323. The cubic root of 6403378 is about 185.6962127806.

The spelling of 6403378 in words is "six million, four hundred three thousand, three hundred seventy-eight".