83684857 has 2 divisors, whose sum is σ = 83684858. Its totient is φ = 83684856.

The previous prime is 83684849. The next prime is 83684917. The reversal of 83684857 is 75848638.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 79905721 + 3779136 = 8939^2 + 1944^2 .

It is a cyclic number.

It is not a de Polignac number, because 83684857 - 2³ = 83684849 is a prime.

It is a super-2 number, since 2×83684857² = 14006310582220898, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 83684857.

It is not a weakly prime, because it can be changed into another prime (83684057) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41842428 + 41842429.

It is an arithmetic number, because the mean of its divisors is an integer number (41842429).

Almost surely, 2^83684857 is an apocalyptic number.

It is an amenable number.

83684857 is a deficient number, since it is larger than the sum of its proper divisors (1).

83684857 is an equidigital number, since it uses as much as digits as its factorization.

83684857 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1290240, while the sum is 49.

The square root of 83684857 is about 9147.9427741979. The cubic root of 83684857 is about 437.4035392235.

It can be divided in two parts, 8368 and 4857, that added together give a square (13225 = 115²).

The spelling of 83684857 in words is "eighty-three million, six hundred eighty-four thousand, eight hundred fifty-seven".