84821697 has 12 divisors (see below), whose sum is σ = 122611684. Its totient is φ = 56505600.

The previous prime is 84821689. The next prime is 84821707. The reversal of 84821697 is 79612848.

84821697 is a `hidden beast` number, since 8 + 482 + 169 + 7 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 49787136 + 35034561 = 7056^2 + 5919^2 .

It is not a de Polignac number, because 84821697 - 2³ = 84821689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (84821657) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13593 + ... + 18825.

Almost surely, 2^84821697 is an apocalyptic number.

It is an amenable number.

84821697 is a deficient number, since it is larger than the sum of its proper divisors (37789987).

84821697 is a wasteful number, since it uses less digits than its factorization.

84821697 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7040 (or 7037 counting only the distinct ones).

The product of its digits is 193536, while the sum is 45.

The square root of 84821697 is about 9209.8695430500. The cubic root of 84821697 is about 439.3753135952.

The spelling of 84821697 in words is "eighty-four million, eight hundred twenty-one thousand, six hundred ninety-seven".