742409 has 2 divisors, whose sum is σ = 742410. Its totient is φ = 742408.

The previous prime is 742393. The next prime is 742439. The reversal of 742409 is 904247.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 739600 + 2809 = 860^2 + 53^2 .

It is a cyclic number.

It is not a de Polignac number, because 742409 - 2⁴ = 742393 is a prime.

It is a super-2 number, since 2×742409² = 1102342246562, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (742439) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 371204 + 371205.

It is an arithmetic number, because the mean of its divisors is an integer number (371205).

2⁷⁴²⁴⁰⁹ is an apocalyptic number.

It is an amenable number.

742409 is a deficient number, since it is larger than the sum of its proper divisors (1).

742409 is an equidigital number, since it uses as much as digits as its factorization.

742409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2016, while the sum is 26.

The square root of 742409 is about 861.6315918071. The cubic root of 742409 is about 90.5484615757.

The spelling of 742409 in words is "seven hundred forty-two thousand, four hundred nine".