84381687 has 24 divisors (see below), whose sum is σ = 136971744. Its totient is φ = 49667904.

The previous prime is 84381683. The next prime is 84381749. The reversal of 84381687 is 78618348.

It is not a de Polignac number, because 84381687 - 2² = 84381683 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84381683) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 12988 + ... + 18369.

It is an arithmetic number, because the mean of its divisors is an integer number (5707156).

Almost surely, 2^84381687 is an apocalyptic number.

84381687 is a deficient number, since it is larger than the sum of its proper divisors (52590057).

84381687 is a wasteful number, since it uses less digits than its factorization.

84381687 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31399 (or 31396 counting only the distinct ones).

The product of its digits is 258048, while the sum is 45.

The square root of 84381687 is about 9185.9505224010. The cubic root of 84381687 is about 438.6142473335.

The spelling of 84381687 in words is "eighty-four million, three hundred eighty-one thousand, six hundred eighty-seven".