7504421 has 2 divisors, whose sum is σ = 7504422. Its totient is φ = 7504420.

The previous prime is 7504381. The next prime is 7504423. The reversal of 7504421 is 1244057.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5827396 + 1677025 = 2414^2 + 1295^2 .

It is an emirp because it is prime and its reverse (1244057) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 7504421 - 2²² = 3310117 is a prime.

It is a Sophie Germain prime.

Together with 7504423, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7504423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3752210 + 3752211.

It is an arithmetic number, because the mean of its divisors is an integer number (3752211).

Almost surely, 2^7504421 is an apocalyptic number.

It is an amenable number.

7504421 is a deficient number, since it is larger than the sum of its proper divisors (1).

7504421 is an equidigital number, since it uses as much as digits as its factorization.

7504421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1120, while the sum is 23.

The square root of 7504421 is about 2739.4198290879. The cubic root of 7504421 is about 195.7818359033.

Adding to 7504421 its reverse (1244057), we get a palindrome (8748478).

The spelling of 7504421 in words is "seven million, five hundred four thousand, four hundred twenty-one".