740009 has 4 divisors (see below), whose sum is σ = 758100. Its totient is φ = 721920.

The previous prime is 739969. The next prime is 740011. The reversal of 740009 is 900047.

740009 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 900047 = 79 ⋅11393.

It can be written as a sum of positive squares in 2 ways, for example, as 313600 + 426409 = 560^2 + 653^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-740009 is a prime.

It is a super-2 number, since 2×740009² = 1095226640162, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (740059) 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, 8984 + ... + 9065.

It is an arithmetic number, because the mean of its divisors is an integer number (189525).

2⁷⁴⁰⁰⁰⁹ is an apocalyptic number.

It is an amenable number.

740009 is a deficient number, since it is larger than the sum of its proper divisors (18091).

740009 is a wasteful number, since it uses less digits than its factorization.

740009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18090.

The product of its (nonzero) digits is 252, while the sum is 20.

The square root of 740009 is about 860.2377578321. The cubic root of 740009 is about 90.4507836545.

The spelling of 740009 in words is "seven hundred forty thousand, nine".