6440351 has 2 divisors, whose sum is σ = 6440352. Its totient is φ = 6440350.

The previous prime is 6440341. The next prime is 6440359. The reversal of 6440351 is 1530446.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 6440351 - 2¹⁰ = 6439327 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6440359) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3220175 + 3220176.

It is an arithmetic number, because the mean of its divisors is an integer number (3220176).

Almost surely, 2^6440351 is an apocalyptic number.

6440351 is a deficient number, since it is larger than the sum of its proper divisors (1).

6440351 is an equidigital number, since it uses as much as digits as its factorization.

6440351 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 6440351 is about 2537.7846638358. The cubic root of 6440351 is about 186.0529294003.

Adding to 6440351 its reverse (1530446), we get a palindrome (7970797).

The spelling of 6440351 in words is "six million, four hundred forty thousand, three hundred fifty-one".