6407881 has 2 divisors, whose sum is σ = 6407882. Its totient is φ = 6407880.

The previous prime is 6407879. The next prime is 6407893. The reversal of 6407881 is 1887046.

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., 4447881 + 1960000 = 2109^2 + 1400^2 .

It is a cyclic number.

It is not a de Polignac number, because 6407881 - 2¹ = 6407879 is a prime.

It is a super-2 number, since 2×6407881² = 82121877820322, which contains 22 as substring.

Together with 6407879, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (6407831) 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, 3203940 + 3203941.

It is an arithmetic number, because the mean of its divisors is an integer number (3203941).

Almost surely, 2^6407881 is an apocalyptic number.

It is an amenable number.

6407881 is a deficient number, since it is larger than the sum of its proper divisors (1).

6407881 is an equidigital number, since it uses as much as digits as its factorization.

6407881 is an odious number, because the sum of its binary digits is odd.

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

The square root of 6407881 is about 2531.3792683041. The cubic root of 6407881 is about 185.7397311711.

The spelling of 6407881 in words is "six million, four hundred seven thousand, eight hundred eighty-one".