84138506 has 4 divisors (see below), whose sum is σ = 126207762. Its totient is φ = 42069252.

The previous prime is 84138499. The next prime is 84138521. The reversal of 84138506 is 60583148.

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

It can be written as a sum of positive squares in only one way, i.e., 79477225 + 4661281 = 8915^2 + 2159^2 .

It is a Curzon number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 21034625 + ... + 21034628.

Almost surely, 2^84138506 is an apocalyptic number.

84138506 is a deficient number, since it is larger than the sum of its proper divisors (42069256).

84138506 is a wasteful number, since it uses less digits than its factorization.

84138506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42069255.

The product of its (nonzero) digits is 23040, while the sum is 35.

The square root of 84138506 is about 9172.7043994669. The cubic root of 84138506 is about 438.1924919987.

The spelling of 84138506 in words is "eighty-four million, one hundred thirty-eight thousand, five hundred six".