724024409 has 2 divisors, whose sum is σ = 724024410. Its totient is φ = 724024408.

The previous prime is 724024397. The next prime is 724024423. The reversal of 724024409 is 904420427.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 447534025 + 276490384 = 21155^2 + 16628^2 .

It is an emirp because it is prime and its reverse (904420427) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 724024409 - 2¹² = 724020313 is a prime.

It is a super-2 number, since 2×724024409² = 1048422689655598562, which contains 22 as substring.

It is equal to p_37431617 and since 724024409 and 37431617 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (724024489) 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, 362012204 + 362012205.

It is an arithmetic number, because the mean of its divisors is an integer number (362012205).

Almost surely, 2^724024409 is an apocalyptic number.

It is an amenable number.

724024409 is a deficient number, since it is larger than the sum of its proper divisors (1).

724024409 is an equidigital number, since it uses as much as digits as its factorization.

724024409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16128, while the sum is 32.

The square root of 724024409 is about 26907.7016669949. The cubic root of 724024409 is about 897.9477555695.

The spelling of 724024409 in words is "seven hundred twenty-four million, twenty-four thousand, four hundred nine".