609749 has 4 divisors (see below), whose sum is σ = 696864. Its totient is φ = 522636.

The previous prime is 609743. The next prime is 609751. The reversal of 609749 is 947906.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 947906 = 2 ⋅473953.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-609749 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (609743) 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 in 3 ways as a sum of consecutive naturals, for example, 43547 + ... + 43560.

It is an arithmetic number, because the mean of its divisors is an integer number (174216).

2⁶⁰⁹⁷⁴⁹ is an apocalyptic number.

It is an amenable number.

609749 is a deficient number, since it is larger than the sum of its proper divisors (87115).

609749 is an equidigital number, since it uses as much as digits as its factorization.

609749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87114.

The product of its (nonzero) digits is 13608, while the sum is 35.

The square root of 609749 is about 780.8642647733. The cubic root of 609749 is about 84.7976269806.

The spelling of 609749 in words is "six hundred nine thousand, seven hundred forty-nine".