84109857 has 16 divisors (see below), whose sum is σ = 122579520. Its totient is φ = 50985792.

The previous prime is 84109853. The next prime is 84109859. The reversal of 84109857 is 75890148.

It is not a de Polignac number, because 84109857 - 2² = 84109853 is a prime.

It is not an unprimeable number, because it can be changed into a prime (84109853) 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, 13482 + ... + 18707.

It is an arithmetic number, because the mean of its divisors is an integer number (7661220).

Almost surely, 2^84109857 is an apocalyptic number.

It is an amenable number.

84109857 is a deficient number, since it is larger than the sum of its proper divisors (38469663).

84109857 is a wasteful number, since it uses less digits than its factorization.

84109857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32272.

The product of its (nonzero) digits is 80640, while the sum is 42.

The square root of 84109857 is about 9171.1426223781. The cubic root of 84109857 is about 438.1427517850.

The spelling of 84109857 in words is "eighty-four million, one hundred nine thousand, eight hundred fifty-seven".