8355861 has 6 divisors (see below), whose sum is σ = 12069590. Its totient is φ = 5570568.

The previous prime is 8355827. The next prime is 8355883. The reversal of 8355861 is 1685538.

It can be written as a sum of positive squares in only one way, i.e., 7535025 + 820836 = 2745^2 + 906^2 .

It is not a de Polignac number, because 8355861 - 2¹⁷ = 8224789 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 (8355661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 464206 + ... + 464223.

Almost surely, 2^8355861 is an apocalyptic number.

It is an amenable number.

8355861 is a deficient number, since it is larger than the sum of its proper divisors (3713729).

8355861 is a wasteful number, since it uses less digits than its factorization.

8355861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 928435 (or 928432 counting only the distinct ones).

The product of its digits is 28800, while the sum is 36.

The square root of 8355861 is about 2890.6506188054. The cubic root of 8355861 is about 202.9225925679.

It can be divided in two parts, 8355 and 861, that added together give a square (9216 = 96²).

The spelling of 8355861 in words is "eight million, three hundred fifty-five thousand, eight hundred sixty-one".