84009739 has 4 divisors (see below), whose sum is σ = 91647000. Its totient is φ = 76372480.

The previous prime is 84009701. The next prime is 84009743. The reversal of 84009739 is 93790048.

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

It is a cyclic number.

It is not a de Polignac number, because 84009739 - 2¹¹ = 84007691 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (84009769) 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, 3818614 + ... + 3818635.

It is an arithmetic number, because the mean of its divisors is an integer number (22911750).

Almost surely, 2^84009739 is an apocalyptic number.

84009739 is a deficient number, since it is larger than the sum of its proper divisors (7637261).

84009739 is a wasteful number, since it uses less digits than its factorization.

84009739 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7637260.

The product of its (nonzero) digits is 54432, while the sum is 40.

The square root of 84009739 is about 9165.6826805209. The cubic root of 84009739 is about 437.9688387859.

It can be divided in two parts, 84009 and 739, that added together give a palindrome (84748).

The spelling of 84009739 in words is "eighty-four million, nine thousand, seven hundred thirty-nine".