84239642 has 4 divisors (see below), whose sum is σ = 126359466. Its totient is φ = 42119820.

The previous prime is 84239633. The next prime is 84239663. The reversal of 84239642 is 24693248.

It is a happy number.

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., 75707401 + 8532241 = 8701^2 + 2921^2 .

It is a junction number, because it is equal to n+sod(n) for n = 84239596 and 84239605.

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, 21059909 + ... + 21059912.

Almost surely, 2^84239642 is an apocalyptic number.

84239642 is a deficient number, since it is larger than the sum of its proper divisors (42119824).

84239642 is a wasteful number, since it uses less digits than its factorization.

84239642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42119823.

The product of its digits is 82944, while the sum is 38.

The square root of 84239642 is about 9178.2156217862. The cubic root of 84239642 is about 438.3679934554.

The spelling of 84239642 in words is "eighty-four million, two hundred thirty-nine thousand, six hundred forty-two".