6403976 has 8 divisors (see below), whose sum is σ = 12007470. Its totient is φ = 3201984.

The previous prime is 6403973. The next prime is 6403979. The reversal of 6403976 is 6793046.

It is an interprime number because it is at equal distance from previous prime (6403973) and next prime (6403979).

It can be written as a sum of positive squares in only one way, i.e., 4301476 + 2102500 = 2074^2 + 1450^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (6403973) 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, 400241 + ... + 400256.

Almost surely, 2^6403976 is an apocalyptic number.

It is an amenable number.

6403976 is a deficient number, since it is larger than the sum of its proper divisors (5603494).

6403976 is a wasteful number, since it uses less digits than its factorization.

6403976 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 800503 (or 800499 counting only the distinct ones).

The product of its (nonzero) digits is 27216, while the sum is 35.

The square root of 6403976 is about 2530.6078321226. The cubic root of 6403976 is about 185.7019932129.

The spelling of 6403976 in words is "six million, four hundred three thousand, nine hundred seventy-six".