7504721 has 4 divisors (see below), whose sum is σ = 8576832. Its totient is φ = 6432612.

The previous prime is 7504711. The next prime is 7504727. The reversal of 7504721 is 1274057.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1274057 = 29 ⋅43933.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7504721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7504727) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 536045 + ... + 536058.

It is an arithmetic number, because the mean of its divisors is an integer number (2144208).

Almost surely, 2^7504721 is an apocalyptic number.

It is an amenable number.

7504721 is a deficient number, since it is larger than the sum of its proper divisors (1072111).

7504721 is a wasteful number, since it uses less digits than its factorization.

7504721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1072110.

The product of its (nonzero) digits is 1960, while the sum is 26.

The square root of 7504721 is about 2739.4745846604. The cubic root of 7504721 is about 195.7844447552.

Adding to 7504721 its reverse (1274057), we get a palindrome (8778778).

The spelling of 7504721 in words is "seven million, five hundred four thousand, seven hundred twenty-one".