84487439 has 2 divisors, whose sum is σ = 84487440. Its totient is φ = 84487438.

The previous prime is 84487423. The next prime is 84487451. The reversal of 84487439 is 93478448.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 84487439 - 2⁴ = 84487423 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 84487393 and 84487402.

It is a congruent number.

It is a weakly prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42243719 + 42243720.

It is an arithmetic number, because the mean of its divisors is an integer number (42243720).

Almost surely, 2^84487439 is an apocalyptic number.

84487439 is a deficient number, since it is larger than the sum of its proper divisors (1).

84487439 is an equidigital number, since it uses as much as digits as its factorization.

84487439 is an evil number, because the sum of its binary digits is even.

The product of its digits is 774144, while the sum is 47.

The square root of 84487439 is about 9191.7049017035. The cubic root of 84487439 is about 438.7974030704.

The spelling of 84487439 in words is "eighty-four million, four hundred eighty-seven thousand, four hundred thirty-nine".