866440319 has 2 divisors, whose sum is σ = 866440320. Its totient is φ = 866440318.

The previous prime is 866440307. The next prime is 866440339. The reversal of 866440319 is 913044668.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-866440319 is a prime.

It is a super-2 number, since 2×866440319² = 1501437652777643522, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (866440339) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 433220159 + 433220160.

It is an arithmetic number, because the mean of its divisors is an integer number (433220160).

Almost surely, 2^866440319 is an apocalyptic number.

866440319 is a deficient number, since it is larger than the sum of its proper divisors (1).

866440319 is an equidigital number, since it uses as much as digits as its factorization.

866440319 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 124416, while the sum is 41.

The square root of 866440319 is about 29435.3583127503. The cubic root of 866440319 is about 953.3364931215.

The spelling of 866440319 in words is "eight hundred sixty-six million, four hundred forty thousand, three hundred nineteen".