743665 has 16 divisors (see below), whose sum is σ = 1019088. Its totient is φ = 516096.

The previous prime is 743657. The next prime is 743669. The reversal of 743665 is 566347.

It can be written as a sum of positive squares in 8 ways, for example, as 31329 + 712336 = 177^2 + 844^2 .

It is a cyclic number.

It is not a de Polignac number, because 743665 - 2³ = 743657 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (743669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 769 + ... + 1441.

It is an arithmetic number, because the mean of its divisors is an integer number (63693).

It is a Poulet number, since it divides 2⁷⁴³⁶⁶⁴-1.

2⁷⁴³⁶⁶⁵ is an apocalyptic number.

It is an amenable number.

743665 is a deficient number, since it is larger than the sum of its proper divisors (275423).

743665 is a wasteful number, since it uses less digits than its factorization.

743665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 708.

The product of its digits is 15120, while the sum is 31.

The square root of 743665 is about 862.3601335869. The cubic root of 743665 is about 90.5994957958.

The spelling of 743665 in words is "seven hundred forty-three thousand, six hundred sixty-five".