6440249 has 2 divisors, whose sum is σ = 6440250. Its totient is φ = 6440248.

The previous prime is 6440201. The next prime is 6440303. The reversal of 6440249 is 9420446.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5914624 + 525625 = 2432^2 + 725^2 .

It is a cyclic number.

It is not a de Polignac number, because 6440249 - 2¹² = 6436153 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (6440149) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3220124 + 3220125.

It is an arithmetic number, because the mean of its divisors is an integer number (3220125).

Almost surely, 2^6440249 is an apocalyptic number.

It is an amenable number.

6440249 is a deficient number, since it is larger than the sum of its proper divisors (1).

6440249 is an equidigital number, since it uses as much as digits as its factorization.

6440249 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6912, while the sum is 29.

The square root of 6440249 is about 2537.7645674885. The cubic root of 6440249 is about 186.0519471817.

The spelling of 6440249 in words is "six million, four hundred forty thousand, two hundred forty-nine".