84409857 has 40 divisors (see below), whose sum is σ = 147662592. Its totient is φ = 47044800.

The previous prime is 84409847. The next prime is 84409861. The reversal of 84409857 is 75890448.

It is not a de Polignac number, because 84409857 - 2⁷ = 84409729 is a prime.

It is not an unprimeable number, because it can be changed into a prime (84409847) 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 39 ways as a sum of consecutive naturals, for example, 21432 + ... + 25062.

Almost surely, 2^84409857 is an apocalyptic number.

It is an amenable number.

84409857 is a deficient number, since it is larger than the sum of its proper divisors (63252735).

84409857 is a wasteful number, since it uses less digits than its factorization.

84409857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3691 (or 3682 counting only the distinct ones).

The product of its (nonzero) digits is 322560, while the sum is 45.

The square root of 84409857 is about 9187.4837142713. The cubic root of 84409857 is about 438.6630509270.

The spelling of 84409857 in words is "eighty-four million, four hundred nine thousand, eight hundred fifty-seven".