745649 has 2 divisors, whose sum is σ = 745650. Its totient is φ = 745648.

The previous prime is 745631. The next prime is 745673. The reversal of 745649 is 946547.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 552049 + 193600 = 743^2 + 440^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-745649 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (745609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 372824 + 372825.

It is an arithmetic number, because the mean of its divisors is an integer number (372825).

2⁷⁴⁵⁶⁴⁹ is an apocalyptic number.

It is an amenable number.

745649 is a deficient number, since it is larger than the sum of its proper divisors (1).

745649 is an equidigital number, since it uses as much as digits as its factorization.

745649 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 30240, while the sum is 35.

The square root of 745649 is about 863.5096988454. The cubic root of 745649 is about 90.6799934154.

The spelling of 745649 in words is "seven hundred forty-five thousand, six hundred forty-nine".