1285857143 has 4 divisors (see below), whose sum is σ = 1285993488. Its totient is φ = 1285720800.

The previous prime is 1285857109. The next prime is 1285857149. The reversal of 1285857143 is 3417585821.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3417585821 = 13 ⋅262891217.

It is a cyclic number.

It is not a de Polignac number, because 1285857143 - 2¹⁰ = 1285856119 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1285857094 and 1285857103.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1285857149) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 52883 + ... + 73268.

It is an arithmetic number, because the mean of its divisors is an integer number (321498372).

Almost surely, 2^1285857143 is an apocalyptic number.

1285857143 is a deficient number, since it is larger than the sum of its proper divisors (136345).

1285857143 is a wasteful number, since it uses less digits than its factorization.

1285857143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136344.

The product of its digits is 268800, while the sum is 44.

The square root of 1285857143 is about 35858.8502743744. The cubic root of 1285857143 is about 1087.4206448988.

The spelling of 1285857143 in words is "one billion, two hundred eighty-five million, eight hundred fifty-seven thousand, one hundred forty-three".