749028409 has 2 divisors, whose sum is σ = 749028410. Its totient is φ = 749028408.

The previous prime is 749028391. The next prime is 749028421. The reversal of 749028409 is 904820947.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 499388409 + 249640000 = 22347^2 + 15800^2 .

It is a cyclic number.

It is not a de Polignac number, because 749028409 - 2⁹ = 749027897 is a prime.

It is a super-2 number, since 2×749028409² = 1122087114978142562, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (749028439) 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, 374514204 + 374514205.

It is an arithmetic number, because the mean of its divisors is an integer number (374514205).

Almost surely, 2^749028409 is an apocalyptic number.

It is an amenable number.

749028409 is a deficient number, since it is larger than the sum of its proper divisors (1).

749028409 is an equidigital number, since it uses as much as digits as its factorization.

749028409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 145152, while the sum is 43.

The square root of 749028409 is about 27368.3833830206. The cubic root of 749028409 is about 908.1677939856.

The spelling of 749028409 in words is "seven hundred forty-nine million, twenty-eight thousand, four hundred nine".