747421 has 2 divisors, whose sum is σ = 747422. Its totient is φ = 747420.

The previous prime is 747407. The next prime is 747427. The reversal of 747421 is 124747.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 511225 + 236196 = 715^2 + 486^2 .

It is a cyclic number.

It is not a de Polignac number, because 747421 - 2¹⁹ = 223133 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (747427) 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, 373710 + 373711.

It is an arithmetic number, because the mean of its divisors is an integer number (373711).

2⁷⁴⁷⁴²¹ is an apocalyptic number.

It is an amenable number.

747421 is a deficient number, since it is larger than the sum of its proper divisors (1).

747421 is an equidigital number, since it uses as much as digits as its factorization.

747421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1568, while the sum is 25.

The square root of 747421 is about 864.5351352027. The cubic root of 747421 is about 90.7517688439.

The spelling of 747421 in words is "seven hundred forty-seven thousand, four hundred twenty-one", and thus it is an iban number.