86780399 has 2 divisors, whose sum is σ = 86780400. Its totient is φ = 86780398.

The previous prime is 86780339. The next prime is 86780413. The reversal of 86780399 is 99308768.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 86780399 - 2⁸ = 86780143 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (86780339) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43390199 + 43390200.

It is an arithmetic number, because the mean of its divisors is an integer number (43390200).

Almost surely, 2^86780399 is an apocalyptic number.

86780399 is a deficient number, since it is larger than the sum of its proper divisors (1).

86780399 is an equidigital number, since it uses as much as digits as its factorization.

86780399 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 653184, while the sum is 50.

The square root of 86780399 is about 9315.5997659839. The cubic root of 86780399 is about 442.7316271666.

The spelling of 86780399 in words is "eighty-six million, seven hundred eighty thousand, three hundred ninety-nine".