7042509 has 6 divisors (see below), whose sum is σ = 10172526. Its totient is φ = 4695000.

The previous prime is 7042501. The next prime is 7042517. The reversal of 7042509 is 9052407.

It is an interprime number because it is at equal distance from previous prime (7042501) and next prime (7042517).

It can be written as a sum of positive squares in only one way, i.e., 3526884 + 3515625 = 1878^2 + 1875^2 .

It is not a de Polignac number, because 7042509 - 2³ = 7042501 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7042501) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 391242 + ... + 391259.

It is an arithmetic number, because the mean of its divisors is an integer number (1695421).

Almost surely, 2^7042509 is an apocalyptic number.

It is an amenable number.

7042509 is a deficient number, since it is larger than the sum of its proper divisors (3130017).

7042509 is a wasteful number, since it uses less digits than its factorization.

7042509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 782507 (or 782504 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 27.

The square root of 7042509 is about 2653.7725976428. The cubic root of 7042509 is about 191.6795598972.

The spelling of 7042509 in words is "seven million, forty-two thousand, five hundred nine".