84421387 has 2 divisors, whose sum is σ = 84421388. Its totient is φ = 84421386.

The previous prime is 84421369. The next prime is 84421411. The reversal of 84421387 is 78312448.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-84421387 is a prime.

It is not a weakly prime, because it can be changed into another prime (84421367) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42210693 + 42210694.

It is an arithmetic number, because the mean of its divisors is an integer number (42210694).

Almost surely, 2^84421387 is an apocalyptic number.

84421387 is a deficient number, since it is larger than the sum of its proper divisors (1).

84421387 is an equidigital number, since it uses as much as digits as its factorization.

84421387 is an evil number, because the sum of its binary digits is even.

The product of its digits is 43008, while the sum is 37.

The square root of 84421387 is about 9188.1111769504. Note that the first 4 decimals coincide. The cubic root of 84421387 is about 438.6830231391.

The spelling of 84421387 in words is "eighty-four million, four hundred twenty-one thousand, three hundred eighty-seven".