6440499 has 32 divisors (see below), whose sum is σ = 10483200. Its totient is φ = 3883680.

The previous prime is 6440491. The next prime is 6440513. The reversal of 6440499 is 9940446.

6440499 is a `hidden beast` number, since 644 + 0 + 4 + 9 + 9 = 666.

It is not a de Polignac number, because 6440499 - 2³ = 6440491 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6440491) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 20554 + ... + 20864.

It is an arithmetic number, because the mean of its divisors is an integer number (327600).

Almost surely, 2^6440499 is an apocalyptic number.

6440499 is a deficient number, since it is larger than the sum of its proper divisors (4042701).

6440499 is a wasteful number, since it uses less digits than its factorization.

6440499 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 392 (or 386 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 36.

The square root of 6440499 is about 2537.8138229587. The cubic root of 6440499 is about 186.0543545619.

The spelling of 6440499 in words is "six million, four hundred forty thousand, four hundred ninety-nine".