6397919 has 8 divisors (see below), whose sum is σ = 6998400. Its totient is φ = 5800600.

The previous prime is 6397903. The next prime is 6397921. The reversal of 6397919 is 9197936.

It is a happy number.

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 6397919 - 2⁴ = 6397903 is a prime.

It is a super-2 number, since 2×6397919² = 81866735061122, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 6397919.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6397949) 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, 6104 + ... + 7074.

It is an arithmetic number, because the mean of its divisors is an integer number (874800).

Almost surely, 2^6397919 is an apocalyptic number.

6397919 is a deficient number, since it is larger than the sum of its proper divisors (600481).

6397919 is a wasteful number, since it uses less digits than its factorization.

6397919 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1581.

The product of its digits is 91854, while the sum is 44.

The square root of 6397919 is about 2529.4108009574. The cubic root of 6397919 is about 185.6434279415.

It can be divided in two parts, 639 and 7919, that added together give a palindrome (8558).

The spelling of 6397919 in words is "six million, three hundred ninety-seven thousand, nine hundred nineteen".