84307987 has 2 divisors, whose sum is σ = 84307988. Its totient is φ = 84307986.

The previous prime is 84307969. The next prime is 84308023. The reversal of 84307987 is 78970348.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 84307987 - 2⁷ = 84307859 is a prime.

It is not a weakly prime, because it can be changed into another prime (84307087) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42153993 + 42153994.

It is an arithmetic number, because the mean of its divisors is an integer number (42153994).

Almost surely, 2^84307987 is an apocalyptic number.

84307987 is a deficient number, since it is larger than the sum of its proper divisors (1).

84307987 is an equidigital number, since it uses as much as digits as its factorization.

84307987 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 338688, while the sum is 46.

The square root of 84307987 is about 9181.9380851757. The cubic root of 84307987 is about 438.4865131176.

The spelling of 84307987 in words is "eighty-four million, three hundred seven thousand, nine hundred eighty-seven".