6399761 has 2 divisors, whose sum is σ = 6399762. Its totient is φ = 6399760.

The previous prime is 6399739. The next prime is 6399793. The reversal of 6399761 is 1679936.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5909761 + 490000 = 2431^2 + 700^2 .

It is a cyclic number.

It is not a de Polignac number, because 6399761 - 2¹⁰ = 6398737 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (6399161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3199880 + 3199881.

It is an arithmetic number, because the mean of its divisors is an integer number (3199881).

Almost surely, 2^6399761 is an apocalyptic number.

It is an amenable number.

6399761 is a deficient number, since it is larger than the sum of its proper divisors (1).

6399761 is an equidigital number, since it uses as much as digits as its factorization.

6399761 is an evil number, because the sum of its binary digits is even.

The product of its digits is 61236, while the sum is 41.

The square root of 6399761 is about 2529.7748911711. The cubic root of 6399761 is about 185.6612421913.

The spelling of 6399761 in words is "six million, three hundred ninety-nine thousand, seven hundred sixty-one".