807686749 has 2 divisors, whose sum is σ = 807686750. Its totient is φ = 807686748.

The previous prime is 807686731. The next prime is 807686753. The reversal of 807686749 is 947686708.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 806844025 + 842724 = 28405^2 + 918^2 .

It is a cyclic number.

It is not a de Polignac number, because 807686749 - 2²¹ = 805589597 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 807686749.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (807686149) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 403843374 + 403843375.

It is an arithmetic number, because the mean of its divisors is an integer number (403843375).

Almost surely, 2^807686749 is an apocalyptic number.

It is an amenable number.

807686749 is a deficient number, since it is larger than the sum of its proper divisors (1).

807686749 is an equidigital number, since it uses as much as digits as its factorization.

807686749 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4064256, while the sum is 55.

The square root of 807686749 is about 28419.8302070931. The cubic root of 807686749 is about 931.2815219034.

The spelling of 807686749 in words is "eight hundred seven million, six hundred eighty-six thousand, seven hundred forty-nine".