6404731 has 8 divisors (see below), whose sum is σ = 6567440. Its totient is φ = 6244128.

The previous prime is 6404719. The next prime is 6404743. The reversal of 6404731 is 1374046.

It is an interprime number because it is at equal distance from previous prime (6404719) and next prime (6404743).

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6404731 is a prime.

It is a super-2 number, since 2×6404731² = 82041158364722, which contains 22 as substring.

It is a Duffinian number.

6404731 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 6404696 and 6404705.

It is not an unprimeable number, because it can be changed into a prime (6404701) 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, 6865 + ... + 7741.

It is an arithmetic number, because the mean of its divisors is an integer number (820930).

Almost surely, 2^6404731 is an apocalyptic number.

6404731 is a deficient number, since it is larger than the sum of its proper divisors (162709).

6404731 is a wasteful number, since it uses less digits than its factorization.

6404731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1053.

The product of its (nonzero) digits is 2016, while the sum is 25.

The square root of 6404731 is about 2530.7570013733. The cubic root of 6404731 is about 185.7092907363.

Adding to 6404731 its reverse (1374046), we get a palindrome (7778777).

The spelling of 6404731 in words is "six million, four hundred four thousand, seven hundred thirty-one".