742865 has 4 divisors (see below), whose sum is σ = 891444. Its totient is φ = 594288.

The previous prime is 742817. The next prime is 742891. The reversal of 742865 is 568247.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 568247 = 79 ⋅7193.

It can be written as a sum of positive squares in 2 ways, for example, as 83521 + 659344 = 289^2 + 812^2 .

It is a cyclic number.

It is not a de Polignac number, because 742865 - 2⁶ = 742801 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 74282 + ... + 74291.

It is an arithmetic number, because the mean of its divisors is an integer number (222861).

2⁷⁴²⁸⁶⁵ is an apocalyptic number.

It is an amenable number.

742865 is a deficient number, since it is larger than the sum of its proper divisors (148579).

742865 is a wasteful number, since it uses less digits than its factorization.

742865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 148578.

The product of its digits is 13440, while the sum is 32.

The square root of 742865 is about 861.8961654399. The cubic root of 742865 is about 90.5669965736.

The spelling of 742865 in words is "seven hundred forty-two thousand, eight hundred sixty-five".