84142505 has 8 divisors (see below), whose sum is σ = 102249600. Its totient is φ = 66461616.

The previous prime is 84142489. The next prime is 84142511. The reversal of 84142505 is 50524148.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 84142505 - 2⁴ = 84142489 is a prime.

It is a super-2 number, since 2×84142505² = 14159922295350050, which contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 106115 + ... + 106904.

It is an arithmetic number, because the mean of its divisors is an integer number (12781200).

Almost surely, 2^84142505 is an apocalyptic number.

It is an amenable number.

84142505 is a deficient number, since it is larger than the sum of its proper divisors (18107095).

84142505 is a wasteful number, since it uses less digits than its factorization.

84142505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 213103.

The product of its (nonzero) digits is 6400, while the sum is 29.

The square root of 84142505 is about 9172.9223805721. The cubic root of 84142505 is about 438.1994341393.

The spelling of 84142505 in words is "eighty-four million, one hundred forty-two thousand, five hundred five".