742009 has 2 divisors, whose sum is σ = 742010.
Its totient is φ = 742008.
The previous prime is 741991. The next prime is 742031. The reversal of 742009 is 900247.
It is an a-pointer prime, because the next prime (742031) can be obtained adding 742009 to its sum of digits (22).
It is a weak prime.
It can be written as a sum of positive squares in only one way, i.e., 727609 + 14400 = 853^2 + 120^2
It is a cyclic number.
It is a de Polignac number, because none of the positive numbers 2k-742009 is a prime.
It is a Chen prime.
It is not a weakly prime, because it can be changed into another prime (742069) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (11) of ones.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 371004 + 371005.
It is an arithmetic number, because the mean of its divisors is an integer number (371005).
2742009 is an apocalyptic number.
It is an amenable number.
742009 is a deficient number, since it is larger than the sum of its proper divisors (1).
742009 is an equidigital number, since it uses as much as digits as its factorization.
742009 is an odious number, because the sum of its binary digits is odd.
The product of its (nonzero) digits is 504, while the sum is 22.
The square root of 742009 is about 861.3994427674.
The cubic root of 742009 is about 90.5321965559.
The spelling of 742009 in words is "seven hundred forty-two thousand, nine".