740309 has 4 divisors (see below), whose sum is σ = 749760. Its totient is φ = 730860.

The previous prime is 740303. The next prime is 740321. The reversal of 740309 is 903047.

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: 903047 = 193 ⋅4679.

It is a cyclic number.

It is not a de Polignac number, because 740309 - 2⁸ = 740053 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (740303) 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, 4607 + ... + 4764.

It is an arithmetic number, because the mean of its divisors is an integer number (187440).

2⁷⁴⁰³⁰⁹ is an apocalyptic number.

740309 is a gapful number since it is divisible by the number (79) formed by its first and last digit.

It is an amenable number.

740309 is a deficient number, since it is larger than the sum of its proper divisors (9451).

740309 is an equidigital number, since it uses as much as digits as its factorization.

740309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9450.

The product of its (nonzero) digits is 756, while the sum is 23.

The square root of 740309 is about 860.4121105610. The cubic root of 740309 is about 90.4630049334.

The spelling of 740309 in words is "seven hundred forty thousand, three hundred nine".