6404009491 has 8 divisors (see below), whose sum is σ = 6992213184. Its totient is φ = 5816809320.

The previous prime is 6404009483. The next prime is 6404009501. The reversal of 6404009491 is 1949004046.

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 6404009491 - 2³ = 6404009483 is a prime.

It is a super-2 number, since 2×6404009491² = 82022675121636158162, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 6404009491.

It is not an unprimeable number, because it can be changed into a prime (6404009441) 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, 237501 + ... + 263086.

It is an arithmetic number, because the mean of its divisors is an integer number (874026648).

Almost surely, 2^6404009491 is an apocalyptic number.

6404009491 is a deficient number, since it is larger than the sum of its proper divisors (588203693).

6404009491 is a wasteful number, since it uses less digits than its factorization.

6404009491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 501761.

The product of its (nonzero) digits is 31104, while the sum is 37.

The square root of 6404009491 is about 80025.0553951698. The cubic root of 6404009491 is about 1857.0231693542.

The spelling of 6404009491 in words is "six billion, four hundred four million, nine thousand, four hundred ninety-one".