84208857 has 4 divisors (see below), whose sum is σ = 112278480. Its totient is φ = 56139236.

The previous prime is 84208847. The next prime is 84208867. The reversal of 84208857 is 75880248.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (84208847) and next prime (84208867).

It is a cyclic number.

It is not a de Polignac number, because 84208857 - 2¹² = 84204761 is a prime.

It is a super-2 number, since 2×84208857² = 14182263194492898, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (84208847) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14034807 + ... + 14034812.

It is an arithmetic number, because the mean of its divisors is an integer number (28069620).

Almost surely, 2^84208857 is an apocalyptic number.

It is an amenable number.

84208857 is a deficient number, since it is larger than the sum of its proper divisors (28069623).

84208857 is a wasteful number, since it uses less digits than its factorization.

84208857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28069622.

The product of its (nonzero) digits is 143360, while the sum is 42.

The square root of 84208857 is about 9176.5383996363. The cubic root of 84208857 is about 438.3145870756.

The spelling of 84208857 in words is "eighty-four million, two hundred eight thousand, eight hundred fifty-seven".