6440451 has 4 divisors (see below), whose sum is σ = 8587272. Its totient is φ = 4293632.

The previous prime is 6440443. The next prime is 6440453. The reversal of 6440451 is 1540446.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 6440451 - 2³ = 6440443 is a prime.

It is a D-number.

6440451 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (6440453) 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, 1073406 + ... + 1073411.

It is an arithmetic number, because the mean of its divisors is an integer number (2146818).

Almost surely, 2^6440451 is an apocalyptic number.

6440451 is a deficient number, since it is larger than the sum of its proper divisors (2146821).

6440451 is a wasteful number, since it uses less digits than its factorization.

6440451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2146820.

The product of its (nonzero) digits is 1920, while the sum is 24.

The square root of 6440451 is about 2537.8043659825. The cubic root of 6440451 is about 186.0538923498.

Adding to 6440451 its reverse (1540446), we get a palindrome (7980897).

The spelling of 6440451 in words is "six million, four hundred forty thousand, four hundred fifty-one".