7467721 has 2 divisors, whose sum is σ = 7467722. Its totient is φ = 7467720.

The previous prime is 7467697. The next prime is 7467737. The reversal of 7467721 is 1277647.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5405625 + 2062096 = 2325^2 + 1436^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7467721 is a prime.

It is not a weakly prime, because it can be changed into another prime (7467751) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3733860 + 3733861.

It is an arithmetic number, because the mean of its divisors is an integer number (3733861).

Almost surely, 2^7467721 is an apocalyptic number.

It is an amenable number.

7467721 is a deficient number, since it is larger than the sum of its proper divisors (1).

7467721 is an equidigital number, since it uses as much as digits as its factorization.

7467721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 16464, while the sum is 34.

The square root of 7467721 is about 2732.7131206916. The cubic root of 7467721 is about 195.4621604192.

The spelling of 7467721 in words is "seven million, four hundred sixty-seven thousand, seven hundred twenty-one".