857540837 has 2 divisors, whose sum is σ = 857540838. Its totient is φ = 857540836.

The previous prime is 857540807. The next prime is 857540861. The reversal of 857540837 is 738045758.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 776792641 + 80748196 = 27871^2 + 8986^2 .

It is a cyclic number.

It is not a de Polignac number, because 857540837 - 2⁸ = 857540581 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 857540791 and 857540800.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (857540807) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 428770418 + 428770419.

It is an arithmetic number, because the mean of its divisors is an integer number (428770419).

Almost surely, 2^857540837 is an apocalyptic number.

It is an amenable number.

857540837 is a deficient number, since it is larger than the sum of its proper divisors (1).

857540837 is an equidigital number, since it uses as much as digits as its factorization.

857540837 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 940800, while the sum is 47.

The square root of 857540837 is about 29283.7981996871. The cubic root of 857540837 is about 950.0612470208.

The spelling of 857540837 in words is "eight hundred fifty-seven million, five hundred forty thousand, eight hundred thirty-seven".