84143749 has 4 divisors (see below), whose sum is σ = 84915820. Its totient is φ = 83371680.

The previous prime is 84143681. The next prime is 84143777. The reversal of 84143749 is 94734148.

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 29235649 + 54908100 = 5407^2 + 7410^2 .

It is a cyclic number.

It is not a de Polignac number, because 84143749 - 2⁹ = 84143237 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84143249) 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, 385872 + ... + 386089.

It is an arithmetic number, because the mean of its divisors is an integer number (21228955).

Almost surely, 2^84143749 is an apocalyptic number.

It is an amenable number.

84143749 is a deficient number, since it is larger than the sum of its proper divisors (772071).

84143749 is a wasteful number, since it uses less digits than its factorization.

84143749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 772070.

The product of its digits is 96768, while the sum is 40.

The square root of 84143749 is about 9172.9901885917. The cubic root of 84143749 is about 438.2015936401.

The spelling of 84143749 in words is "eighty-four million, one hundred forty-three thousand, seven hundred forty-nine".