84695721 has 16 divisors (see below), whose sum is σ = 123354048. Its totient is φ = 51264000.

The previous prime is 84695719. The next prime is 84695759. The reversal of 84695721 is 12759648.

It is not a de Polignac number, because 84695721 - 2¹ = 84695719 is a prime.

It is a plaindrome in base 12.

It is not an unprimeable number, because it can be changed into a prime (84695761) 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, 38565 + ... + 40701.

It is an arithmetic number, because the mean of its divisors is an integer number (7709628).

Almost surely, 2^84695721 is an apocalyptic number.

It is an amenable number.

84695721 is a deficient number, since it is larger than the sum of its proper divisors (38658327).

84695721 is a wasteful number, since it uses less digits than its factorization.

84695721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3352.

The product of its digits is 120960, while the sum is 42.

The square root of 84695721 is about 9203.0278169742. The cubic root of 84695721 is about 439.1576877944.

The spelling of 84695721 in words is "eighty-four million, six hundred ninety-five thousand, seven hundred twenty-one".