83947217 has 16 divisors (see below), whose sum is σ = 90685440. Its totient is φ = 77515152.

The previous prime is 83947211. The next prime is 83947219. The reversal of 83947217 is 71274938.

It is a de Polignac number, because none of the positive numbers 2^k-83947217 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (83947211) 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, 84908 + ... + 85890.

It is an arithmetic number, because the mean of its divisors is an integer number (5667840).

Almost surely, 2^83947217 is an apocalyptic number.

It is an amenable number.

83947217 is a deficient number, since it is larger than the sum of its proper divisors (6738223).

83947217 is a wasteful number, since it uses less digits than its factorization.

83947217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1132.

The product of its digits is 84672, while the sum is 41.

The square root of 83947217 is about 9162.2713886896. The cubic root of 83947217 is about 437.8601629592.

The spelling of 83947217 in words is "eighty-three million, nine hundred forty-seven thousand, two hundred seventeen".