84163987 has 2 divisors, whose sum is σ = 84163988. Its totient is φ = 84163986.

The previous prime is 84163979. The next prime is 84163999. The reversal of 84163987 is 78936148.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 84163987 - 2³ = 84163979 is a prime.

It is not a weakly prime, because it can be changed into another prime (84163907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42081993 + 42081994.

It is an arithmetic number, because the mean of its divisors is an integer number (42081994).

Almost surely, 2^84163987 is an apocalyptic number.

84163987 is a deficient number, since it is larger than the sum of its proper divisors (1).

84163987 is an equidigital number, since it uses as much as digits as its factorization.

84163987 is an evil number, because the sum of its binary digits is even.

The product of its digits is 290304, while the sum is 46.

The square root of 84163987 is about 9174.0932521966. The cubic root of 84163987 is about 438.2367224645.

It can be divided in two parts, 8416 and 3987, that added together give a triangular number (12403 = T₁₅₇).

The spelling of 84163987 in words is "eighty-four million, one hundred sixty-three thousand, nine hundred eighty-seven".