749909 has 2 divisors, whose sum is σ = 749910. Its totient is φ = 749908.

The previous prime is 749899. The next prime is 749923. The reversal of 749909 is 909947.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 688900 + 61009 = 830^2 + 247^2 .

It is a cyclic number.

It is not a de Polignac number, because 749909 - 2⁴ = 749893 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (749939) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 374954 + 374955.

It is an arithmetic number, because the mean of its divisors is an integer number (374955).

2⁷⁴⁹⁹⁰⁹ is an apocalyptic number.

It is an amenable number.

749909 is a deficient number, since it is larger than the sum of its proper divisors (1).

749909 is an equidigital number, since it uses as much as digits as its factorization.

749909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20412, while the sum is 38.

The square root of 749909 is about 865.9728633162. The cubic root of 749909 is about 90.8523548713.

Adding to 749909 its sum of digits (38), we get a palindrome (749947).

The spelling of 749909 in words is "seven hundred forty-nine thousand, nine hundred nine".