749985729 has 4 divisors (see below), whose sum is σ = 999980976. Its totient is φ = 499990484.

The previous prime is 749985647. The next prime is 749985751. The reversal of 749985729 is 927589947.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 927589947 = 3 ⋅309196649.

It is a cyclic number.

It is not a de Polignac number, because 749985729 - 2¹⁷ = 749854657 is a prime.

It is a super-2 number, since 2×749985729² = 1124957187407322882, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (749985529) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 124997619 + ... + 124997624.

It is an arithmetic number, because the mean of its divisors is an integer number (249995244).

Almost surely, 2^749985729 is an apocalyptic number.

It is an amenable number.

749985729 is a deficient number, since it is larger than the sum of its proper divisors (249995247).

749985729 is a wasteful number, since it uses less digits than its factorization.

749985729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 249995246.

The product of its digits is 11430720, while the sum is 60.

The square root of 749985729 is about 27385.8673223982. The cubic root of 749985729 is about 908.5545336844.

The spelling of 749985729 in words is "seven hundred forty-nine million, nine hundred eighty-five thousand, seven hundred twenty-nine".