7540909 has 2 divisors, whose sum is σ = 7540910. Its totient is φ = 7540908.

The previous prime is 7540903. The next prime is 7540913. The reversal of 7540909 is 9090457.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5076009 + 2464900 = 2253^2 + 1570^2 .

It is a cyclic number.

It is not a de Polignac number, because 7540909 - 2³ = 7540901 is a prime.

7540909 is a modest number, since divided by 909 gives 754 as remainder.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7540901) 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, 3770454 + 3770455.

It is an arithmetic number, because the mean of its divisors is an integer number (3770455).

Almost surely, 2^7540909 is an apocalyptic number.

It is an amenable number.

7540909 is a deficient number, since it is larger than the sum of its proper divisors (1).

7540909 is an equidigital number, since it uses as much as digits as its factorization.

7540909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11340, while the sum is 34.

The square root of 7540909 is about 2746.0715576984. The cubic root of 7540909 is about 196.0986331969.

The spelling of 7540909 in words is "seven million, five hundred forty thousand, nine hundred nine".