6400007 has 4 divisors (see below), whose sum is σ = 6776496. Its totient is φ = 6023520.

The previous prime is 6399971. The next prime is 6400013. The reversal of 6400007 is 7000046.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7000046 = 2 ⋅3500023.

It is a cyclic number.

It is not a de Polignac number, because 6400007 - 2¹⁰ = 6398983 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17), and also a Moran number because the ratio is a prime number: 376471 = 6400007 / (6 + 4 + 0 + 0 + 0 + 0 + 7).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6400607) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 188219 + ... + 188252.

It is an arithmetic number, because the mean of its divisors is an integer number (1694124).

Almost surely, 2^6400007 is an apocalyptic number.

6400007 is a deficient number, since it is larger than the sum of its proper divisors (376489).

6400007 is a wasteful number, since it uses less digits than its factorization.

6400007 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 376488.

The product of its (nonzero) digits is 168, while the sum is 17.

The square root of 6400007 is about 2529.8235116308. The cubic root of 6400007 is about 185.6636210343.

It can be divided in two parts, 6 and 400007, that multiplied together give a palindrome (2400042).

The spelling of 6400007 in words is "six million, four hundred thousand, seven".