6440379 has 8 divisors (see below), whose sum is σ = 9367872. Its totient is φ = 3903240.

The previous prime is 6440359. The next prime is 6440383. The reversal of 6440379 is 9730446.

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

It is not a de Polignac number, because 6440379 - 2¹¹ = 6438331 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33), and also a Moran number because the ratio is a prime number: 195163 = 6440379 / (6 + 4 + 4 + 0 + 3 + 7 + 9).

It is not an unprimeable number, because it can be changed into a prime (6440359) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 97549 + ... + 97614.

It is an arithmetic number, because the mean of its divisors is an integer number (1170984).

Almost surely, 2^6440379 is an apocalyptic number.

6440379 is a deficient number, since it is larger than the sum of its proper divisors (2927493).

6440379 is a wasteful number, since it uses less digits than its factorization.

6440379 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 195177.

The product of its (nonzero) digits is 18144, while the sum is 33.

The square root of 6440379 is about 2537.7901804523. The cubic root of 6440379 is about 186.0531990272.

The spelling of 6440379 in words is "six million, four hundred forty thousand, three hundred seventy-nine".