742665 has 32 divisors (see below), whose sum is σ = 1483776. Its totient is φ = 308160.

The previous prime is 742663. The next prime is 742673. The reversal of 742665 is 566247.

It is not a de Polignac number, because 742665 - 2¹ = 742663 is a prime.

It is a Smith number, since the sum of its digits (30) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

742665 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (742663) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 834 + ... + 1476.

It is an arithmetic number, because the mean of its divisors is an integer number (46368).

2⁷⁴²⁶⁶⁵ is an apocalyptic number.

It is an amenable number.

742665 is a deficient number, since it is larger than the sum of its proper divisors (741111).

742665 is a wasteful number, since it uses less digits than its factorization.

742665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 669.

The product of its digits is 10080, while the sum is 30.

The square root of 742665 is about 861.7801343730. The cubic root of 742665 is about 90.5588681227.

The spelling of 742665 in words is "seven hundred forty-two thousand, six hundred sixty-five".