1868756857 has 16 divisors (see below), whose sum is σ = 2081777472. Its totient is φ = 1663269120.

The previous prime is 1868756833. The next prime is 1868756861. The reversal of 1868756857 is 7586578681.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1868756857 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1868756795 and 1868756804.

It is not an unprimeable number, because it can be changed into a prime (1868726857) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 101518 + ... + 118504.

It is an arithmetic number, because the mean of its divisors is an integer number (130111092).

Almost surely, 2^1868756857 is an apocalyptic number.

It is an amenable number.

1868756857 is a deficient number, since it is larger than the sum of its proper divisors (213020615).

1868756857 is a wasteful number, since it uses less digits than its factorization.

1868756857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17208.

The product of its digits is 22579200, while the sum is 61.

The square root of 1868756857 is about 43229.1204745135. The cubic root of 1868756857 is about 1231.7359006991.

The spelling of 1868756857 in words is "one billion, eight hundred sixty-eight million, seven hundred fifty-six thousand, eight hundred fifty-seven".