86838421 has 2 divisors, whose sum is σ = 86838422. Its totient is φ = 86838420.

The previous prime is 86838419. The next prime is 86838473. The reversal of 86838421 is 12483868.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 46376100 + 40462321 = 6810^2 + 6361^2 .

It is a cyclic number.

It is not a de Polignac number, because 86838421 - 2¹ = 86838419 is a prime.

It is a super-2 number, since 2×86838421² = 15081822723546482, which contains 22 as substring.

Together with 86838419, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (86838481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43419210 + 43419211.

It is an arithmetic number, because the mean of its divisors is an integer number (43419211).

Almost surely, 2^86838421 is an apocalyptic number.

It is an amenable number.

86838421 is a deficient number, since it is larger than the sum of its proper divisors (1).

86838421 is an equidigital number, since it uses as much as digits as its factorization.

86838421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 73728, while the sum is 40.

The square root of 86838421 is about 9318.7134841672. The cubic root of 86838421 is about 442.8302763693.

The spelling of 86838421 in words is "eighty-six million, eight hundred thirty-eight thousand, four hundred twenty-one".