857747945 has 8 divisors (see below), whose sum is σ = 1029727944. Its totient is φ = 685911424.

The previous prime is 857747941. The next prime is 857747963. The reversal of 857747945 is 549747758.

It can be written as a sum of positive squares in 4 ways, for example, as 183982096 + 673765849 = 13564^2 + 25957^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 857747945 - 2² = 857747941 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (857747941) 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 7 ways as a sum of consecutive naturals, for example, 22244 + ... + 47013.

It is an arithmetic number, because the mean of its divisors is an integer number (128715993).

Almost surely, 2^857747945 is an apocalyptic number.

It is an amenable number.

857747945 is a deficient number, since it is larger than the sum of its proper divisors (171979999).

857747945 is a wasteful number, since it uses less digits than its factorization.

857747945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71739.

The product of its digits is 9878400, while the sum is 56.

The square root of 857747945 is about 29287.3342078107. The cubic root of 857747945 is about 950.1377251848.

The spelling of 857747945 in words is "eight hundred fifty-seven million, seven hundred forty-seven thousand, nine hundred forty-five".