84887639 has 2 divisors, whose sum is σ = 84887640. Its totient is φ = 84887638.

The previous prime is 84887623. The next prime is 84887653. The reversal of 84887639 is 93678848.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 84887639 - 2⁴ = 84887623 is a prime.

It is a super-2 number, since 2×84887639² = 14411822509988642, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (84887659) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42443819 + 42443820.

It is an arithmetic number, because the mean of its divisors is an integer number (42443820).

Almost surely, 2^84887639 is an apocalyptic number.

84887639 is a deficient number, since it is larger than the sum of its proper divisors (1).

84887639 is an equidigital number, since it uses as much as digits as its factorization.

84887639 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2322432, while the sum is 53.

The square root of 84887639 is about 9213.4488113844. The cubic root of 84887639 is about 439.4891436767.

The spelling of 84887639 in words is "eighty-four million, eight hundred eighty-seven thousand, six hundred thirty-nine".