7242839 has 2 divisors, whose sum is σ = 7242840. Its totient is φ = 7242838.

The previous prime is 7242803. The next prime is 7242847. The reversal of 7242839 is 9382427.

It is a strong prime.

It is an emirp because it is prime and its reverse (9382427) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 7242839 - 2¹² = 7238743 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 7242799 and 7242808.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7242139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3621419 + 3621420.

It is an arithmetic number, because the mean of its divisors is an integer number (3621420).

Almost surely, 2^7242839 is an apocalyptic number.

7242839 is a deficient number, since it is larger than the sum of its proper divisors (1).

7242839 is an equidigital number, since it uses as much as digits as its factorization.

7242839 is an evil number, because the sum of its binary digits is even.

The product of its digits is 24192, while the sum is 35.

The square root of 7242839 is about 2691.2523107282. The cubic root of 7242839 is about 193.4800884015.

The spelling of 7242839 in words is "seven million, two hundred forty-two thousand, eight hundred thirty-nine".