84890129 has 4 divisors (see below), whose sum is σ = 89883684. Its totient is φ = 79896576.

The previous prime is 84890123. The next prime is 84890137. The reversal of 84890129 is 92109848.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 52171729 + 32718400 = 7223^2 + 5720^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-84890129 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (84890123) 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 3 ways as a sum of consecutive naturals, for example, 2496752 + ... + 2496785.

It is an arithmetic number, because the mean of its divisors is an integer number (22470921).

Almost surely, 2^84890129 is an apocalyptic number.

It is an amenable number.

84890129 is a deficient number, since it is larger than the sum of its proper divisors (4993555).

84890129 is a wasteful number, since it uses less digits than its factorization.

84890129 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4993554.

The product of its (nonzero) digits is 41472, while the sum is 41.

The square root of 84890129 is about 9213.5839389458. The cubic root of 84890129 is about 439.4934407973.

The spelling of 84890129 in words is "eighty-four million, eight hundred ninety thousand, one hundred twenty-nine".