747221 has 4 divisors (see below), whose sum is σ = 751212. Its totient is φ = 743232.

The previous prime is 747203. The next prime is 747223. The reversal of 747221 is 122747.

747221 is nontrivially palindromic in base 7.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 122747 = 131 ⋅937.

It can be written as a sum of positive squares in 2 ways, for example, as 483025 + 264196 = 695^2 + 514^2 .

It is a cyclic number.

It is not a de Polignac number, because 747221 - 2⁶ = 747157 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 747221.

It is not an unprimeable number, because it can be changed into a prime (747223) 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, 1700 + ... + 2093.

It is an arithmetic number, because the mean of its divisors is an integer number (187803).

2⁷⁴⁷²²¹ is an apocalyptic number.

It is an amenable number.

747221 is a deficient number, since it is larger than the sum of its proper divisors (3991).

747221 is a wasteful number, since it uses less digits than its factorization.

747221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3990.

The product of its digits is 784, while the sum is 23.

The square root of 747221 is about 864.4194583650. The cubic root of 747221 is about 90.7436734630.

Adding to 747221 its reverse (122747), we get a palindrome (869968).

The spelling of 747221 in words is "seven hundred forty-seven thousand, two hundred twenty-one", and thus it is an iban number.