740857 has 4 divisors (see below), whose sum is σ = 797860. Its totient is φ = 683856.

The previous prime is 740849. The next prime is 740891. The reversal of 740857 is 758047.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 385641 + 355216 = 621^2 + 596^2 .

It is a cyclic number.

It is not a de Polignac number, because 740857 - 2³ = 740849 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (740897) 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 in 3 ways as a sum of consecutive naturals, for example, 28482 + ... + 28507.

It is an arithmetic number, because the mean of its divisors is an integer number (199465).

2⁷⁴⁰⁸⁵⁷ is an apocalyptic number.

It is an amenable number.

740857 is a deficient number, since it is larger than the sum of its proper divisors (57003).

740857 is a wasteful number, since it uses less digits than its factorization.

740857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57002.

The product of its (nonzero) digits is 7840, while the sum is 31.

The square root of 740857 is about 860.7305037002. The cubic root of 740857 is about 90.4853206149.

The spelling of 740857 in words is "seven hundred forty thousand, eight hundred fifty-seven".