84142237 has 4 divisors (see below), whose sum is σ = 84707100. Its totient is φ = 83577376.

The previous prime is 84142213. The next prime is 84142243. The reversal of 84142237 is 73224148.

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 23707161 + 60435076 = 4869^2 + 7774^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-84142237 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 84142199 and 84142208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84142207) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 282208 + ... + 282505.

It is an arithmetic number, because the mean of its divisors is an integer number (21176775).

Almost surely, 2^84142237 is an apocalyptic number.

It is an amenable number.

84142237 is a deficient number, since it is larger than the sum of its proper divisors (564863).

84142237 is a wasteful number, since it uses less digits than its factorization.

84142237 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 564862.

The product of its digits is 10752, while the sum is 31.

The square root of 84142237 is about 9172.9077723479. The cubic root of 84142237 is about 438.1989689065.

The spelling of 84142237 in words is "eighty-four million, one hundred forty-two thousand, two hundred thirty-seven".