842686057 has 8 divisors (see below), whose sum is σ = 847864584. Its totient is φ = 837516288.

The previous prime is 842686027. The next prime is 842686069. The reversal of 842686057 is 750686248.

It can be written as a sum of positive squares in 4 ways, for example, as 163353961 + 679332096 = 12781^2 + 26064^2 .

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 842686057 - 2¹⁵ = 842653289 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 842685998 and 842686016.

It is not an unprimeable number, because it can be changed into a prime (842686027) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 379683 + ... + 381895.

It is an arithmetic number, because the mean of its divisors is an integer number (105983073).

Almost surely, 2^842686057 is an apocalyptic number.

It is an amenable number.

842686057 is a deficient number, since it is larger than the sum of its proper divisors (5178527).

842686057 is a wasteful number, since it uses less digits than its factorization.

842686057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4379.

The product of its (nonzero) digits is 645120, while the sum is 46.

The square root of 842686057 is about 29029.0553928301. The cubic root of 842686057 is about 944.5434398617.

The spelling of 842686057 in words is "eight hundred forty-two million, six hundred eighty-six thousand, fifty-seven".