6401878 has 8 divisors (see below), whose sum is σ = 10974672. Its totient is φ = 2743656.

The previous prime is 6401869. The next prime is 6401887. The reversal of 6401878 is 8781046.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (6401869) and next prime (6401887).

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 228625 + ... + 228652.

It is an arithmetic number, because the mean of its divisors is an integer number (1371834).

Almost surely, 2^6401878 is an apocalyptic number.

6401878 is a deficient number, since it is larger than the sum of its proper divisors (4572794).

6401878 is a wasteful number, since it uses less digits than its factorization.

6401878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 457286.

The product of its (nonzero) digits is 10752, while the sum is 34.

The square root of 6401878 is about 2530.1932732501. The cubic root of 6401878 is about 185.6817117848.

The spelling of 6401878 in words is "six million, four hundred one thousand, eight hundred seventy-eight".