86705421 has 16 divisors (see below), whose sum is σ = 126335808. Its totient is φ = 52457600.

The previous prime is 86705407. The next prime is 86705429. The reversal of 86705421 is 12450768.

It is a cyclic number.

It is not a de Polignac number, because 86705421 - 2⁹ = 86704909 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (86705429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20401 + ... + 24281.

It is an arithmetic number, because the mean of its divisors is an integer number (7895988).

Almost surely, 2^86705421 is an apocalyptic number.

It is an amenable number.

86705421 is a deficient number, since it is larger than the sum of its proper divisors (39630387).

86705421 is a wasteful number, since it uses less digits than its factorization.

86705421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4572.

The product of its (nonzero) digits is 13440, while the sum is 33.

The square root of 86705421 is about 9311.5745714675. The cubic root of 86705421 is about 442.6040841689.

It can be divided in two parts, 86 and 705421, that added together give a palindrome (705507).

The spelling of 86705421 in words is "eighty-six million, seven hundred five thousand, four hundred twenty-one".