7045721 has 4 divisors (see below), whose sum is σ = 7165200. Its totient is φ = 6926244.

The previous prime is 7045699. The next prime is 7045739. The reversal of 7045721 is 1275407.

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: 1275407 = 7 ⋅182201.

It is a cyclic number.

It is not a de Polignac number, because 7045721 - 2⁶ = 7045657 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (7045781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 59651 + ... + 59768.

It is an arithmetic number, because the mean of its divisors is an integer number (1791300).

Almost surely, 2^7045721 is an apocalyptic number.

It is an amenable number.

7045721 is a deficient number, since it is larger than the sum of its proper divisors (119479).

7045721 is a wasteful number, since it uses less digits than its factorization.

7045721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 119478.

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

The square root of 7045721 is about 2654.3777048491. The cubic root of 7045721 is about 191.7086963489.

The spelling of 7045721 in words is "seven million, forty-five thousand, seven hundred twenty-one".