749427309 has 28 divisors (see below), whose sum is σ = 1162405500. Its totient is φ = 482376384.

The previous prime is 749427293. The next prime is 749427311. The reversal of 749427309 is 903724947.

It can be written as a sum of positive squares in 2 ways, for example, as 327248100 + 422179209 = 18090^2 + 20547^2 .

It is not a de Polignac number, because 749427309 - 2⁴ = 749427293 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (749427379) 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 in 27 ways as a sum of consecutive naturals, for example, 3417 + ... + 38865.

Almost surely, 2^749427309 is an apocalyptic number.

It is an amenable number.

749427309 is a deficient number, since it is larger than the sum of its proper divisors (412978191).

749427309 is an equidigital number, since it uses as much as digits as its factorization.

749427309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35496 (or 35481 counting only the distinct ones).

The product of its (nonzero) digits is 381024, while the sum is 45.

The square root of 749427309 is about 27375.6700191977. The cubic root of 749427309 is about 908.3289822833.

The spelling of 749427309 in words is "seven hundred forty-nine million, four hundred twenty-seven thousand, three hundred nine".