749640989 has 2 divisors, whose sum is σ = 749640990. Its totient is φ = 749640988.

The previous prime is 749640937. The next prime is 749641019. The reversal of 749640989 is 989046947.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 746218489 + 3422500 = 27317^2 + 1850^2 .

It is a cyclic number.

It is not a de Polignac number, because 749640989 - 2¹² = 749636893 is a prime.

It is a super-2 number, since 2×749640989² = 1123923224777796242, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (749643989) 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, 374820494 + 374820495.

It is an arithmetic number, because the mean of its divisors is an integer number (374820495).

Almost surely, 2^749640989 is an apocalyptic number.

It is an amenable number.

749640989 is a deficient number, since it is larger than the sum of its proper divisors (1).

749640989 is an equidigital number, since it uses as much as digits as its factorization.

749640989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3919104, while the sum is 56.

The square root of 749640989 is about 27379.5724765746. The cubic root of 749640989 is about 908.4153029937.

The spelling of 749640989 in words is "seven hundred forty-nine million, six hundred forty thousand, nine hundred eighty-nine".