74399729 has 2 divisors, whose sum is σ = 74399730. Its totient is φ = 74399728.

The previous prime is 74399719. The next prime is 74399737. The reversal of 74399729 is 92799347.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 72709729 + 1690000 = 8527^2 + 1300^2 .

It is an emirp because it is prime and its reverse (92799347) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-74399729 is a prime.

It is not a weakly prime, because it can be changed into another prime (74399719) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37199864 + 37199865.

It is an arithmetic number, because the mean of its divisors is an integer number (37199865).

Almost surely, 2^74399729 is an apocalyptic number.

It is an amenable number.

74399729 is a deficient number, since it is larger than the sum of its proper divisors (1).

74399729 is an equidigital number, since it uses as much as digits as its factorization.

74399729 is an evil number, because the sum of its binary digits is even.

The product of its digits is 857304, while the sum is 50.

The square root of 74399729 is about 8625.5277519697. The cubic root of 74399729 is about 420.5882328306.

The spelling of 74399729 in words is "seventy-four million, three hundred ninety-nine thousand, seven hundred twenty-nine".