74155729 has 2 divisors, whose sum is σ = 74155730. Its totient is φ = 74155728.

The previous prime is 74155723. The next prime is 74155843. The reversal of 74155729 is 92755147.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 66455104 + 7700625 = 8152^2 + 2775^2 .

It is a cyclic number.

It is not a de Polignac number, because 74155729 - 2²¹ = 72058577 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 74155691 and 74155700.

It is not a weakly prime, because it can be changed into another prime (74155723) 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, 37077864 + 37077865.

It is an arithmetic number, because the mean of its divisors is an integer number (37077865).

Almost surely, 2^74155729 is an apocalyptic number.

It is an amenable number.

74155729 is a deficient number, since it is larger than the sum of its proper divisors (1).

74155729 is an equidigital number, since it uses as much as digits as its factorization.

74155729 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 88200, while the sum is 40.

The square root of 74155729 is about 8611.3720741819. The cubic root of 74155729 is about 420.1279447692.

The spelling of 74155729 in words is "seventy-four million, one hundred fifty-five thousand, seven hundred twenty-nine".