84638913 has 4 divisors (see below), whose sum is σ = 112851888. Its totient is φ = 56425940.

The previous prime is 84638893. The next prime is 84639013. The reversal of 84638913 is 31983648.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 84638913 - 2⁸ = 84638657 is a prime.

It is not an unprimeable number, because it can be changed into a prime (84638513) 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 in 3 ways as a sum of consecutive naturals, for example, 14106483 + ... + 14106488.

It is an arithmetic number, because the mean of its divisors is an integer number (28212972).

Almost surely, 2^84638913 is an apocalyptic number.

It is an amenable number.

84638913 is a deficient number, since it is larger than the sum of its proper divisors (28212975).

84638913 is a wasteful number, since it uses less digits than its factorization.

84638913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28212974.

The product of its digits is 124416, while the sum is 42.

The square root of 84638913 is about 9199.9409237234. The cubic root of 84638913 is about 439.0594803548.

The spelling of 84638913 in words is "eighty-four million, six hundred thirty-eight thousand, nine hundred thirteen".