740409 has 4 divisors (see below), whose sum is σ = 987216. Its totient is φ = 493604.

The previous prime is 740387. The next prime is 740423. The reversal of 740409 is 904047.

740409 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 a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 904047 = 3 ⋅301349.

It is a cyclic number.

It is not a de Polignac number, because 740409 - 2⁸ = 740153 is a prime.

It is a D-number.

It is not an unprimeable number, because it can be changed into a prime (740429) 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, 123399 + ... + 123404.

It is an arithmetic number, because the mean of its divisors is an integer number (246804).

2⁷⁴⁰⁴⁰⁹ is an apocalyptic number.

It is an amenable number.

740409 is a deficient number, since it is larger than the sum of its proper divisors (246807).

740409 is a wasteful number, since it uses less digits than its factorization.

740409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 246806.

The product of its (nonzero) digits is 1008, while the sum is 24.

The square root of 740409 is about 860.4702202866. The cubic root of 740409 is about 90.4670779593.

The spelling of 740409 in words is "seven hundred forty thousand, four hundred nine".