744089821 has 2 divisors, whose sum is σ = 744089822. Its totient is φ = 744089820.

The previous prime is 744089791. The next prime is 744089831. The reversal of 744089821 is 128980447.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 743652900 + 436921 = 27270^2 + 661^2 .

It is a cyclic number.

It is not a de Polignac number, because 744089821 - 2⁵ = 744089789 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (744089831) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 372044910 + 372044911.

It is an arithmetic number, because the mean of its divisors is an integer number (372044911).

Almost surely, 2^744089821 is an apocalyptic number.

It is an amenable number.

744089821 is a deficient number, since it is larger than the sum of its proper divisors (1).

744089821 is an equidigital number, since it uses as much as digits as its factorization.

744089821 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 129024, while the sum is 43.

The square root of 744089821 is about 27278.0098430952. The cubic root of 744089821 is about 906.1674426197.

The spelling of 744089821 in words is "seven hundred forty-four million, eighty-nine thousand, eight hundred twenty-one".