857144623 has 4 divisors (see below), whose sum is σ = 857288080. Its totient is φ = 857001168.

The previous prime is 857144621. The next prime is 857144653. The reversal of 857144623 is 326441758.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 326441758 = 2 ⋅163220879.

It is a cyclic number.

It is not a de Polignac number, because 857144623 - 2¹ = 857144621 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (857144621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 62358 + ... + 74851.

It is an arithmetic number, because the mean of its divisors is an integer number (214322020).

Almost surely, 2^857144623 is an apocalyptic number.

857144623 is a deficient number, since it is larger than the sum of its proper divisors (143457).

857144623 is a wasteful number, since it uses less digits than its factorization.

857144623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 143456.

The product of its digits is 161280, while the sum is 40.

The square root of 857144623 is about 29277.0323461925. The cubic root of 857144623 is about 949.9149039198.

The spelling of 857144623 in words is "eight hundred fifty-seven million, one hundred forty-four thousand, six hundred twenty-three".