7450721 has 2 divisors, whose sum is σ = 7450722. Its totient is φ = 7450720.

The previous prime is 7450699. The next prime is 7450747. The reversal of 7450721 is 1270547.

It is an a-pointer prime, because the next prime (7450747) can be obtained adding 7450721 to its sum of digits (26).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4774225 + 2676496 = 2185^2 + 1636^2 .

It is an emirp because it is prime and its reverse (1270547) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 7450721 - 2¹⁴ = 7434337 is a prime.

It is a Sophie Germain prime.

It is an alternating number because its digits alternate between odd and even.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (7450021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3725360 + 3725361.

It is an arithmetic number, because the mean of its divisors is an integer number (3725361).

Almost surely, 2^7450721 is an apocalyptic number.

It is an amenable number.

7450721 is a deficient number, since it is larger than the sum of its proper divisors (1).

7450721 is an equidigital number, since it uses as much as digits as its factorization.

7450721 is an evil number, because the sum of its binary digits is even.

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

The square root of 7450721 is about 2729.6008865766. The cubic root of 7450721 is about 195.3137268531.

The spelling of 7450721 in words is "seven million, four hundred fifty thousand, seven hundred twenty-one".