744386821 has 2 divisors, whose sum is σ = 744386822. Its totient is φ = 744386820.

The previous prime is 744386801. The next prime is 744386869. The reversal of 744386821 is 128683447.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 729756196 + 14630625 = 27014^2 + 3825^2 .

It is a cyclic number.

It is not a de Polignac number, because 744386821 - 2¹³ = 744378629 is a prime.

It is a super-2 number, since 2×744386821² = 1108223478556972082, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (744386801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 372193410 + 372193411.

It is an arithmetic number, because the mean of its divisors is an integer number (372193411).

Almost surely, 2^744386821 is an apocalyptic number.

It is an amenable number.

744386821 is a deficient number, since it is larger than the sum of its proper divisors (1).

744386821 is an equidigital number, since it uses as much as digits as its factorization.

744386821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 258048, while the sum is 43.

The square root of 744386821 is about 27283.4532455113. The cubic root of 744386821 is about 906.2879907593.

The spelling of 744386821 in words is "seven hundred forty-four million, three hundred eighty-six thousand, eight hundred twenty-one".