740609 has 4 divisors (see below), whose sum is σ = 749616. Its totient is φ = 731604.

The previous prime is 740603. The next prime is 740651. The reversal of 740609 is 906047.

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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-740609 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (740603) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4379 + ... + 4544.

It is an arithmetic number, because the mean of its divisors is an integer number (187404).

2⁷⁴⁰⁶⁰⁹ is an apocalyptic number.

It is an amenable number.

740609 is a deficient number, since it is larger than the sum of its proper divisors (9007).

740609 is an equidigital number, since it uses as much as digits as its factorization.

740609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9006.

The product of its (nonzero) digits is 1512, while the sum is 26.

The square root of 740609 is about 860.5864279664. The cubic root of 740609 is about 90.4752229110.

The spelling of 740609 in words is "seven hundred forty thousand, six hundred nine".