86786421 has 4 divisors (see below), whose sum is σ = 115715232. Its totient is φ = 57857612.

The previous prime is 86786419. The next prime is 86786431. The reversal of 86786421 is 12468768.

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 86786421 - 2¹ = 86786419 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (86786431) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14464401 + ... + 14464406.

It is an arithmetic number, because the mean of its divisors is an integer number (28928808).

Almost surely, 2^86786421 is an apocalyptic number.

It is an amenable number.

86786421 is a deficient number, since it is larger than the sum of its proper divisors (28928811).

86786421 is a wasteful number, since it uses less digits than its factorization.

86786421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28928810.

The product of its digits is 129024, while the sum is 42.

The square root of 86786421 is about 9315.9229816481. The cubic root of 86786421 is about 442.7418678362.

The spelling of 86786421 in words is "eighty-six million, seven hundred eighty-six thousand, four hundred twenty-one".