6440977 has 8 divisors (see below), whose sum is σ = 6986952. Its totient is φ = 5913600.

The previous prime is 6440969. The next prime is 6440983. The reversal of 6440977 is 7790446.

It can be written as a sum of positive squares in 4 ways, for example, as 2047761 + 4393216 = 1431^2 + 2096^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 6440977 - 2³ = 6440969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6440947) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3924 + ... + 5317.

It is an arithmetic number, because the mean of its divisors is an integer number (873369).

Almost surely, 2^6440977 is an apocalyptic number.

It is an amenable number.

6440977 is a deficient number, since it is larger than the sum of its proper divisors (545975).

6440977 is a wasteful number, since it uses less digits than its factorization.

6440977 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9299.

The product of its (nonzero) digits is 42336, while the sum is 37.

The square root of 6440977 is about 2537.9079967564. The cubic root of 6440977 is about 186.0589572996.

It can be divided in two parts, 64 and 40977, that added together give a triangular number (41041 = T₂₈₆).

The spelling of 6440977 in words is "six million, four hundred forty thousand, nine hundred seventy-seven".