86440817 has 2 divisors, whose sum is σ = 86440818. Its totient is φ = 86440816.

The previous prime is 86440799. The next prime is 86440829. The reversal of 86440817 is 71804468.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 44502241 + 41938576 = 6671^2 + 6476^2 .

It is a cyclic number.

It is not a de Polignac number, because 86440817 - 2²⁶ = 19331953 is a prime.

It is not a weakly prime, because it can be changed into another prime (86440847) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43220408 + 43220409.

It is an arithmetic number, because the mean of its divisors is an integer number (43220409).

Almost surely, 2^86440817 is an apocalyptic number.

It is an amenable number.

86440817 is a deficient number, since it is larger than the sum of its proper divisors (1).

86440817 is an equidigital number, since it uses as much as digits as its factorization.

86440817 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 43008, while the sum is 38.

The square root of 86440817 is about 9297.3553766649. The cubic root of 86440817 is about 442.1533851334.

The spelling of 86440817 in words is "eighty-six million, four hundred forty thousand, eight hundred seventeen".