6440149 has 2 divisors, whose sum is σ = 6440150. Its totient is φ = 6440148.

The previous prime is 6440143. The next prime is 6440171. The reversal of 6440149 is 9410446.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6426225 + 13924 = 2535^2 + 118^2 .

It is a cyclic number.

It is not a de Polignac number, because 6440149 - 2³ = 6440141 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6440141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3220074 + 3220075.

It is an arithmetic number, because the mean of its divisors is an integer number (3220075).

Almost surely, 2^6440149 is an apocalyptic number.

It is an amenable number.

6440149 is a deficient number, since it is larger than the sum of its proper divisors (1).

6440149 is an equidigital number, since it uses as much as digits as its factorization.

6440149 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 6440149 is about 2537.7448650327. The cubic root of 6440149 is about 186.0509842121.

The spelling of 6440149 in words is "six million, four hundred forty thousand, one hundred forty-nine".