84042939 has 4 divisors (see below), whose sum is σ = 112057256. Its totient is φ = 56028624.

The previous prime is 84042923. The next prime is 84042949. The reversal of 84042939 is 93924048.

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

It is not a de Polignac number, because 84042939 - 2⁴ = 84042923 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 84042897 and 84042906.

It is not an unprimeable number, because it can be changed into a prime (84042949) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14007154 + ... + 14007159.

It is an arithmetic number, because the mean of its divisors is an integer number (28014314).

Almost surely, 2^84042939 is an apocalyptic number.

84042939 is a deficient number, since it is larger than the sum of its proper divisors (28014317).

84042939 is a wasteful number, since it uses less digits than its factorization.

84042939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28014316.

The product of its (nonzero) digits is 62208, while the sum is 39.

The square root of 84042939 is about 9167.4936051246. The cubic root of 84042939 is about 438.0265251549.

The spelling of 84042939 in words is "eighty-four million, forty-two thousand, nine hundred thirty-nine".