736609 has 4 divisors (see below), whose sum is σ = 738820. Its totient is φ = 734400.

The previous prime is 736607. The next prime is 736639. The reversal of 736609 is 906637.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 906637 = 23 ⋅39419.

It can be written as a sum of positive squares in 2 ways, for example, as 394384 + 342225 = 628^2 + 585^2 .

It is a cyclic number.

It is not a de Polignac number, because 736609 - 2¹ = 736607 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (736607) 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, 492 + ... + 1309.

It is an arithmetic number, because the mean of its divisors is an integer number (184705).

2⁷³⁶⁶⁰⁹ is an apocalyptic number.

It is an amenable number.

736609 is a deficient number, since it is larger than the sum of its proper divisors (2211).

736609 is a wasteful number, since it uses less digits than its factorization.

736609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2210.

The product of its (nonzero) digits is 6804, while the sum is 31.

The square root of 736609 is about 858.2592848318. The cubic root of 736609 is about 90.3120444137.

The spelling of 736609 in words is "seven hundred thirty-six thousand, six hundred nine".